Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f87e95470d8f5a4…

MALICIOUS

PDF

76.0 KB Created: 2021-01-14 02:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bc360adb8d4f265229864e6d60939783 SHA-1: 3fb19706c330c1de4be4e8ed89b9abdb468f8a87 SHA-256: 0f87e95470d8f5a40a814114010e4c9b03bfa0cbf2dbc794a5d83dc66ac972f6
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it is designed to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/wb?keyword=checking%20root%20jailbreak%20on%20device%20is%20ready PDF link annotation
    • https://site-1174866.mozfiles.com/files/1174866/capital_fund_management_llp.pdfIn PDF document text
    • https://site-1242381.mozfiles.com/files/1242381/template_of_minutes_of_meetings_examples.pdfIn PDF document text
    • https://site-1195159.mozfiles.com/files/1195159/mugezipuxogadodo.pdfIn PDF document text
    • https://site-1194434.mozfiles.com/files/1194434/gavuvaxewuvi.pdfIn PDF document text
    • https://site-1172834.mozfiles.com/files/1172834/train_taxi_app.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/entergy_louisiana_bill_pay_login.pdfIn PDF document text
    • https://site-1177442.mozfiles.com/files/1177442/asrm_egg_donor_compensation_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/figBidg/outer_limits_episode_o._b._i._t.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/jhihfxL/dulotif.pdfIn PDF document text
    • https://site-1210587.mozfiles.com/files/1210587/d_b_college_ka_full_form.pdfIn PDF document text
    • https://lewofadexireg.weebly.com/uploads/1/3/4/8/134868993/zigobiwudizefoz.pdfIn PDF document text
    • https://site-1171686.mozfiles.com/files/1171686/cheese_in_the_trap_ost.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
    • 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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 5452 bytes
SHA-256: f01b4545bfd644c95e9ed015a95c2803048de212f9881d1007589fda9e96e939
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 9656 bytes
SHA-256: 266bb3ffa46fdc073bdf9045cb39a0b22695da107af9438bf1722484606953aa
font_02_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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