Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1ff7d1439e8b52…

MALICIOUS

PDF

76.0 KB Created: 2021-06-08 22:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9878292a5ae11214792104ce9918d234 SHA-1: db8af78ee31286b79ed7d6f50f8fbddf5305bbba SHA-256: 4b1ff7d1439e8b52d618d780a28aa0f431a4c8fa55ecbe523a3ae2700aa8d259
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://laborke.ru/pbw?utm_term=asphalt+nitro+8+apk+mod PDF link annotation
    • https://sofabavoxikavup.weebly.com/uploads/1/3/4/6/134636307/ed4fd612b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_603e0b057409a.pdfIn PDF document text
    • https://ruzovaberup.weebly.com/uploads/1/3/4/6/134651658/felamerudu_betowadifatazu_muxolik_fujaseb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5ff768047e7b5.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/77172798.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/pizalum-likodetuxo-kiwazunabuda.pdfIn PDF document text
    • https://zunaxezosepoto.weebly.com/uploads/1/3/0/7/130739564/movixikavidudaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5fd7ef4689af8.pdfIn PDF document text
    • https://kuwoloxafi.weebly.com/uploads/1/3/0/8/130873903/ce448b100af04b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jazonewu.pbworks.com/f/pokemon_sword_and_shield_apk_download_for_android_free.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144449757/que_paso_ayer_2_banda_sonora.pdfIn PDF document text
    • http://dokajawema.pbworks.com/w/file/fetch/144888120/2188447044.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/daturuzu.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/43724333525.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/sole_f80_treadmill_repair_manual.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/f/walstad_method_soil.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/xadekidakubelezus.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/40214348493.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/f/82830011784.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/zugudabemewirozupaw.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144595974/how_to_use_semi_automatic_washing_machine_in_hindi.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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 5448 bytes
SHA-256: 1691dd99c132d0d8bd80b442daab2153163d62774de7a23d8b093a398044e14e
font_01_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 10616 bytes
SHA-256: 018fa6c58d97c6431ba884ee2ac9e8b4d7848d6b102638a4edb00f9c1278b26d

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