Malicious PDF — malware analysis report

Static analysis result for SHA-256 544b7d42fb800986…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 22:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0e6e5d451648d3ef856bb1ed370e4f9d SHA-1: 5798c7d8fc7437ec1850303fb5aa85e50f8f1c40 SHA-256: 544b7d42fb800986fe395cfc768ca4c90fc066ea45608fc7b2df67f7668aae05
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to known malicious redirectors or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially garbled, contains text related to 'figure drawing reference photos free' which likely serves as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=figure+drawing+reference+photos+free In PDF document text
    • http://moneymaya.site/7908472073692qam.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/adjustment_program_l380_freenrtsl.pdfIn PDF document text
    • http://remontnatali.ru/48483152317kdsem.pdfIn PDF document text
    • https://kuvinobugo.weebly.com/uploads/1/3/1/3/131383931/60496161aa7a7.pdfIn PDF document text
    • https://kaxaratit.weebly.com/uploads/1/3/5/3/135383379/4772949.pdfIn PDF document text
    • https://javodezupaxut.weebly.com/uploads/1/3/1/3/131380273/nufifanurulori.pdfIn PDF document text
    • http://sendgrid-de.com/3744087126001g8.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/2508032.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/which_of_the_following_statements_is_true_about_price.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/batch_type_centrifugal_machine.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/moxukogukuwutalamafu.pdfIn PDF document text
    • http://baltika-trans.com/how_to_start_a_lifestyle_blog_for_beginners9banq.pdfIn PDF document text
    • http://iciko.xyz/momirazotebugowosonigose12gol.pdfIn PDF document text
    • https://metesanej.weebly.com/uploads/1/3/1/8/131858044/buxemilukekubem_tenedipike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0d79105d-d52a-43a0-8d55-e8855781b3fc/what_is_speed_of_light_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8bb4a3-6816-474e-bbae-c23aef32df2a/57383880690.pdfIn PDF document text
    • http://zegegapo.rf.gd/martin_dmx_512_lighting_control_software_free.pdfIn PDF document text
    • http://mibexumobanoko.rf.gd/skull_card_game_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0e9a20-6280-43ab-a7cb-e1a7e93a0658/wagujutivufekevijow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb445542-93bc-4d33-b6ba-90cf33d76c51/tin_tin_chinese_menu_market_bosworth.pdfIn PDF document text
    • http://nakuwoxadi.epizy.com/8708035708.pdfIn PDF document text
    • http://pemukusa.epizy.com/demigods_and_magicians_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d0afab-ffba-4b56-9571-17cf16da7870/how_to_write_a_warning_letter_to_employee_for_late_coming.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 5312 bytes
SHA-256: b6382da741557fec8a6fc768b044f9f6b860efafba8de196a8e8a9e146c21c63
font_01_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 11004 bytes
SHA-256: 8cd0806d652a83d1bac31836ef46efdbb1db04059003dda26bb0be8a1ccb488e
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3