Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa85febc2a67b279…

MALICIOUS

PDF

74.0 KB Created: 2021-03-05 14:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3f8240880a5c877e2265e15403d806b1 SHA-1: dbe50be49b5d862c4975949bf5e3acb1f88f91c5 SHA-256: aa85febc2a67b27969c140252d0e6d6ef568534e32e623463240df90140c8692
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, with one prominent URL pointing to a potential phishing or malware distribution site. The PDF structure and embedded content suggest it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=ariana+grande+song+lyrics+7+rings PDF link annotation
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/458838.pdfIn PDF document text
    • http://blockhcain.host/vicks_vaporizer_v150sgn_manual2ahlc.pdfIn PDF document text
    • http://visiblawty.com/algorithms_by_sartaj_sahniemw96.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/4dc4570649.pdfIn PDF document text
    • http://usesalon.xyz/417799291366if85.pdfIn PDF document text
    • http://instup.xyz/sefofbg8gy.pdfIn PDF document text
    • https://zazanopub.weebly.com/uploads/1/3/2/7/132712119/nelorikaxevid_womaje.pdfIn PDF document text
    • https://zigapugulila.weebly.com/uploads/1/3/0/7/130776078/xazomuwibux.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/14a4184d.pdfIn PDF document text
    • http://girameluxo.iblogger.org/que_hace_un_rrhh_en_una_empresa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/adverse_effects_of_corticosteroids.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_5a475e382e8840e383f5b605034d9c10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/rules_of_the_game_neil_strauss_read_online.pdfIn PDF document text
    • http://fibejebovef.epizy.com/98648334194.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/68883137002.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_bdd46e1362c74dacac0d6af753d2fabc.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_e561696e30ae4b86917610a1859be30d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f168c8-c18e-4898-88a9-1a6078a148a9/pasugafesutotalug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221b3fe5-32e9-4287-acda-0e78a62cacee/naxuwojikajufojexoxo.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_77424d0863f74143b3c6ddd80e30dae2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davubewu/xilasejuselola.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_50b7a235e1e04191a47b63f9aba61817.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5798deca-92ba-4da3-ac23-956f9fd5d65c/how_to_check_post_office_bank_account_balance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0069ecb-6252-4efc-b540-a6e69f72e480/2003_cadillac_cts_repair_manual_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/zojefik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd400cd-3119-44f6-9c07-262e7f1de47d/tozefutitenojuvovano.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_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5276 bytes
SHA-256: 9629b63557c9ba96544fb2f67ac7915fdf54622c3749c73799d7ee3086871a22
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 10720 bytes
SHA-256: e6527cedc6139edf38c6848450805ab71296438a3dd9a039f184573a8b6f4e0f