Malicious PDF — malware analysis report

Static analysis result for SHA-256 49314193fe4d9292…

MALICIOUS

PDF

75.7 KB Created: 2021-06-02 14:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec7d06113cf8d5a5bf2ff7be01e17826 SHA-1: 9840568c40747fb5b91a8d213ccd16503220f38b SHA-256: 49314193fe4d9292a0279a5664b858b9476fe3f4d3fb6d575f3cd533a4ee350b
226 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or lead to phishing sites. The document body, though heavily obfuscated, appears to be a lure related to a phone issue, intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=telefono%20grandstream%20gxp1405%20no%20recibe%20llamadas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450732/normal_6063d6a4a2b78.pdfIn PDF document text
    • https://kozizekovina.weebly.com/uploads/1/3/4/8/134891358/8fbdeaa1b083.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/xavamifosagen.pdfIn PDF document text
    • https://jeziwirumefije.weebly.com/uploads/1/3/4/6/134670599/mixibiwese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_602f090b2a703.pdfIn PDF document text
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/retoxavesil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428334/normal_6006146e9b4ae.pdfIn PDF document text
    • https://nedosadowizo.weebly.com/uploads/1/3/5/3/135347652/borut-pimivuxotexe-wuzil-repulupokur.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/c74e7.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/5700672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501975/normal_6026be2f210ed.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/fuwux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476767/normal_6007f55881dd6.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/2397423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144411681/how_to_mix_salt_reef_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9ce5bb-8174-4ae6-adb2-4e22d9da60ed/psychology_101_final_exam_answers.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/f/88163929250.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/download_apk_any_video_converter_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29bab998-17b9-46e1-8218-ad6d430e9be7/big_fish_market_menu_moreno_valley_ca.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/grade_12_chemistry_textbook_answers_mcgraw-hill.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/f/is_warcraft_2_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c015674a-686d-4706-80c5-78e68b1f2c23/canon_pixma_mx922_support_code_b200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86ddb06-5ca6-4f31-b788-8200b8bf2da4/kixevikexumabibobabapun.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144468840/twilight_saga_2009_full_movie_download_in_hindi_hd_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a421980-2aca-40a2-8a99-123b74e34d6b/10422222452.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_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 6040 bytes
SHA-256: 6681ad6ebbeb6cc523d6110387b94e762a0fc939fe9bd55b60d4e43d170730ee
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 11580 bytes
SHA-256: b09d7ec2308f714580be6db9a9db9fd00f7ccb70a336de7838ad3ff045792685