Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea97ec792f1b0ab8…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 00:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 016a7d7cc129a7c33907d78eb4fc30db SHA-1: a929f003bd28378ea1385ad9321d25a37d14ee56 SHA-256: ea97ec792f1b0ab862778f60d2c30791ff771bf3e86b32aaa6547d2410b3bde6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a significant number pointing to potentially disposable hosting. The document body is heavily obfuscated and appears to contain metadata related to its generation, rather than user-facing content. The primary attack pattern involves directing users to external URLs, which could host phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=mathematical+ideas+in+biology+pdf PDF link annotation
    • https://cdn.sqhk.co/wixumenez/sZhJzhe/81048784914.pdfIn PDF document text
    • http://repair-telefonov.ru/57038622370j3nkm.pdfIn PDF document text
    • http://zisilusekaxe.22web.org/at_t_tv_now_channel_lineup.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/who_is_the_ugliest_female_kpop_idol_2020l4562.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/ebBViap/dot_connect_line_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zigotimuti/EoPhiGW/uncertainties_definition_biology.pdfIn PDF document text
    • http://shopsupergood.site/tozomodmdsd.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/jejaSie/62653278347.pdfIn PDF document text
    • http://edayafar.xyz/yukon_gold_big_al_net_worthw1s7k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e73f99e-165a-4dbd-8c5f-7a1e767df57e/mr._coffee_dwx23_12-cup_programmable_coffee_maker_-_black.pdfIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_f3493ed3f2cf40e7a70b1cbe1ad9db81.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_4e0c7a276390466e9b9c31a893a911a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7387475-aeb0-4cd8-b31d-1d3af936cd43/what_is_the_order_of_the_marvel_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52000240-d8af-498b-81a3-397123ac2f91/spd_sx_not_powering_on.pdfIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_2bafeda85b7a4ec6b688d435b5b1c694.pdf?index=trueIn PDF document text
    • http://letelexedat.epizy.com/79845397384.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_a44bbaff11dc4fafa15c79eff37b3a1f.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_b7845a0a623042a3ab17ad05e8e6eafe.pdf?index=trueIn PDF document text
    • http://wodatefajudofow.epizy.com/45916420016.pdfIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_4e3a1aca214c4252b4069787773198d4.pdf?index=trueIn PDF document text
    • https://52e7b0fa-0041-4536-a49e-9c44ef68b7f3.filesusr.com/ugd/3835dd_cd0cd1969b7d40319a488b6da14a2edd.pdf?index=trueIn PDF document text
    • http://gonesolipekivin.rf.gd/mixed_strategy_nash_equilibrium_solver.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_dd3618b1e006484e846f9111bf7fa41c.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_c8b009e5e88b44b3b7e342ec155c0560.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_02168da05c464574ab0cbdf7eb2fed9f.pdf?index=trueIn PDF document text
    • http://veboxin.epizy.com/habitually_chic_gift_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabab53f-7968-4f06-9306-f1e7fcac0ddb/fujitsu_fi-6130_win_10.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 5720 bytes
SHA-256: a526e1d552dcf339eec02e2158a4ee1bb8a376722d85ac405019e216bdd00c6c
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10544 bytes
SHA-256: 2ec5479e7ea588243d032ac9266f8f52aa052744612d1a0f669f8574be984cae

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