Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9bbd4d8a7c919f4…

MALICIOUS

PDF

81.3 KB Created: 2021-04-10 23:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16e46fe1bdeec7dbc9c99852bf2f6d79 SHA-1: 116d2d9960d7af6a062562088fc3726400e72467 SHA-256: f9bbd4d8a7c919f4ae52e8cb6eaeb103e8fbb683aaa6776f9f92261637bb80b2
186 Risk Score

Malware Insights

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

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 0.9990

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://golowaki.ru/strik?utm_term=ipod+touch+5th+generation+price+in+bangladesh PDF link annotation
    • http://videohost.space/rebigavokorunokalxrho.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/4dffc94.pdfIn PDF document text
    • http://socialwave.me/what_is_the_best_stock_market_app_for_beginnersai0oc.pdfIn PDF document text
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/feduduzino.pdfIn PDF document text
    • https://sivirezu.weebly.com/uploads/1/3/4/4/134445297/fec52469f2.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/005507aa71bc4.pdfIn PDF document text
    • https://suzigenetulaja.weebly.com/uploads/1/3/4/7/134756603/5929866.pdfIn PDF document text
    • http://canonsburglake.org/45171636989gsgod.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/gofutomolela-wemiramemep-kubuvimo-taredojo.pdfIn PDF document text
    • https://lepasedesefin.weebly.com/uploads/1/3/4/6/134625589/lamomolu.pdfIn PDF document text
    • http://kdghy.online/marriage_counseling_questions_reddit8icqa.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/logedumexixujijanu.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/6cceb191ff8a.pdfIn PDF document text
    • http://instacopyrightcenter.com/cross_words_crossword_puzzle_cluejp0st.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/gobuzomebo_komijopenok_nidipofebi.pdfIn PDF document text
    • https://rumevupalod.weebly.com/uploads/1/3/0/7/130739773/redutijaj_zeniku_fisuteg.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/5313ff6555b.pdfIn PDF document text
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/gomidi.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/8290730.pdfIn PDF document text
    • https://gavititexufo.weebly.com/uploads/1/3/3/9/133997787/falil.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://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_e46d63ba66db43cc839cb4bb17d652de.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_c5ac9fcf92fd4d4b8a5ec0d429a21b53.pdf?index=trueIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_e5cd2df8e4284d338a400df0d55d944a.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_1b0e93bf524c45599a296a438f4e3328.pdf?index=trueIn 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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5420 bytes
SHA-256: 9a211593a21dbd5c0f25c711193f4bd81cd7956b729285600501c2fc330ec92a
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 11224 bytes
SHA-256: b131fcce83648378abdce2a3f45b55f7e1bc4a8d34ad853cb6b07f1d72d6877b
font_02_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3