Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bb35afac683179…

MALICIOUS

PDF

76.9 KB Created: 2021-06-05 06:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 14438281920cfa04be00b2ff5ae0351e SHA-1: 5b63d1bfa4bffe33e6b5ccedfa767ebd4a5751b9 SHA-256: 59bb35afac683179bb3f58bab667cfae238d51183de6ee7ac8c41c2b5dc48761
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'Bellsouth.net email login', suggesting a credential harvesting lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=bellsouth.net+email+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380871/normal_6068fb7fe1599.pdfIn PDF document text
    • https://mumetepelexax.weebly.com/uploads/1/3/4/4/134461787/tizevonijadurugeweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6041c1ca51439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6069f8051686e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_602cb06d207a4.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/visavu_dimarekepa_batubu_vudamub.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/9964174.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/b55dfcc3-6829-40a8-97b6-ddfed0a45675/23168230711.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144415476/bounce_tales_download_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e06199-8379-4d67-b5b9-d0d90fdd1d18/36796519469.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/genetics_in_medicine_nussbaum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31dbcdd3-ff03-4162-bfa4-d3f1019518a2/89352925049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb183d3-8b30-4ea4-b767-5fb704462e95/evenflo_convertible_car_seat_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6026cda-17d7-4c68-b00d-d6bf1914796d/is_30_mbps_good_for_ps4.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144639513/wolevudolixetetubibijofir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8411a446-cabc-412c-ba61-038ae1d0d292/94283863035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa5f79b-1652-4fbb-ba3a-4a8f51b38fc6/64989686546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da20a2f-8e6e-4e28-80fe-5b999c9d8a18/how_much_is_it_to_send_an_international_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68efa6b6-0dc8-4d42-9eaf-1237d143156a/fluke_5615_probe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd22982-5a8b-4f3f-8364-cab70c36894d/the_royal_ranger_book_4_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d0a133-4032-4f28-a4aa-3cb062b0938a/96965754841.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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 5084 bytes
SHA-256: d71b6c11ff7258a0b8f04bcbdec023d2cbb5b875e8dac6ee041eb47538ea6357
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 11352 bytes
SHA-256: f8a3cf84f616eead1bee8740a4030fca6d3d7b3632d2755a3f07d95c32258675