Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9ed3cedbc2536e…

MALICIOUS

PDF

140.5 KB Created: 2021-03-19 17:36:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d80d20afaca51f2fa0b845fd09517f9f SHA-1: 5500283687f35c7dceefb84ebe6d65d2776fd27e SHA-256: 1a9ed3cedbc2536e17f40a99087a295f5b62f8f590273227862bfb4de2caf05f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting many links on disposable domains, often using UTM parameters to track clicks, which is common in phishing campaigns. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/aws?utm_term=pl+sql+collections+tutorial+with+examples PDF link annotation
    • https://cdn.sqhk.co/gabebutiz/hiiajhl/blood_of_a_stranger_video.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/driver_acer_aspire_e14_e5-_473g.pdfIn PDF document text
    • http://naturmilans.fun/how_to_add_pictures_to_a_photo_albumep35c.pdfIn PDF document text
    • http://mnogoturov.com/adox_rodinalct4jk.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/Cidgehb/vomukamewelibogisifef.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ryAzieA/kobunenegamenu.pdfIn PDF document text
    • http://zesepajokab.22web.org/94212513607.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/ibShjhN/fapufetatapofawufap.pdfIn PDF document text
    • http://shopwithsale.website/romelaniximoridalisbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_6015146fb0659.pdfIn PDF document text
    • http://springtea.space/contoh_soal_dan_jawaban_akrual_basis_dan_cash_basisqd8f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_601b34f1ce6a9.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://uploads.strikinglycdn.com/files/34c129be-efe8-4d5f-99f8-22d1d47384ef/cub_scout_cyber_chip_bears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d398116-cceb-4356-bbb5-cccf3fd49a35/96537845805.pdfIn PDF document text
    • http://lojeler.epizy.com/ergonomic_chair_design.pdfIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_3d9650c507964ff78a3cbd54ddc39015.pdf?index=trueIn PDF document text
    • https://2108ee29-f41f-4224-afb3-8e24ca2f7712.filesusr.com/ugd/279473_49a3edcc5d43472f9fb0e8fe57f5c7ec.pdf?index=trueIn PDF document text
    • http://pegireg.rf.gd/16004631760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5467dbf-b66b-4ed7-bb9a-d4a54e6a7a4c/78853619457.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_8801e556baa041249cefc7f25a73b44e.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_d8aea0de3d674788bd255e75699020c1.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_off0001dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC32 5344 bytes
SHA-256: fe5de075f7cebe1ad1a50563995ccc068591dac8374145e9598bbb6261b96904
font_01_sfnt_off0001ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE40 11520 bytes
SHA-256: ad13847fdb85fb4cb2c4b294d4c86c0e0b048d91566fb7ef65a1fc929d682d46
font_02_sfnt_off000215a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215A1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361