Malicious PDF — malware analysis report

Static analysis result for SHA-256 7239c081ce0ec0a3…

MALICIOUS

PDF

66.6 KB Created: 2021-01-02 19:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: af3664517a226705cad30ed08f70febc SHA-1: 98a34e226b730cbb2015286f5016fae27eab60c3 SHA-256: 7239c081ce0ec0a397d821167e10efd373be2b2141850857a22c22c18b095a23
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Credentials from Password Store T1059.007 JavaScript

This PDF file exhibits malicious characteristics, including a critical heuristic firing for linking to known malicious redirector infrastructure. It also employs lures consistent with credential phishing and callback scams, aiming to trick users into divulging sensitive information or initiating fraudulent transactions. The presence of numerous embedded URLs, many pointing to link farms, further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/wb?keyword=myaicampus%20student%20login In PDF document text
    • https://fekujize.weebly.com/uploads/1/3/4/8/134869517/worigakinub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f95ce777ac9a.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/fimudamewokik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f871d4bf2612.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/ca9fcf6b-02a6-46f6-9625-af115e5ce922/star_wars_earth_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b5e0d4-e156-4f3f-8612-76e9fd373bb2/bendy_mods_minecraft_1._12_2_curseforge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f8d1829-6c43-4fe5-ac4e-1a9c650de46b/tara_maclay_fanfiction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d453af9b-35de-42a9-8562-fbf71720c3d9/what_is_a_direct_variation_in_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba51adf7-ea82-4ec7-a23e-d332f443359a/dibewidevojudovamalut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ea50c3-766f-421b-a6f3-1a1e8ab8e3ac/pedunoxodiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2e56ea-c763-4847-b99a-184a587d88da/26599213044.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_off0000c597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 5404 bytes
SHA-256: 3db124bcebfbdad6b3e5670aabe94afd6616b9c440b7c9b4775e817964226e46
font_01_sfnt_off0000d7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 11152 bytes
SHA-256: ac8e4dcaf44aa671637025f086e6eab152b80e2734f2e4f3202c52163af458e7

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