Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac65711a6d34e92f…

MALICIOUS

PDF

73.1 KB Created: 2020-12-07 14:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 80071be304b60c45fa5e9de9375074b2 SHA-1: 93d9871ef15bedb881cbdf9a57117a4e5ebb2ca4 SHA-256: ac65711a6d34e92f8651e02869cbc255aadf305a10dd1eb15c9967c857a1602f
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting critical heuristic firings for malicious redirector links and a link farm. The document body, though heavily obfuscated, contains references to 'Google pixel android 10 update issues', suggesting a lure for phishing or a scam. The presence of numerous external links, including one to a known malicious redirector, indicates an attempt to direct users to harmful websites, likely to exploit vulnerabilities or steal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffmen.ru/aws?utm_term=google+pixel+android+10+update+issues In PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fc2dede97ba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5fa4d503b47b7.pdfIn PDF document text
    • https://tinalolovini.weebly.com/uploads/1/3/4/3/134371967/4526133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_5fa421ad3f1ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f98721278b4e.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/puwifobexisi.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lorewuk.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/6bbefedfd08f.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/wopugilosapejajiwufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/49735145766.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/ap_biology_outlines.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/ap_eamcet_hall_ticket_2019_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9125cb9-5fa7-47f8-9935-9c8efdd61316/pawuwebaniguwizaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dec41b9-043e-4c48-a3a1-f71b24773b61/lasinalo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/kexokovovikoxizizisajos.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/biology_book_for_class_9_punjab_board.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 5420 bytes
SHA-256: 95378e72d414db20b03e5a71821821274bb21b68378af5d1bc6fb8b32b25106e
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 10764 bytes
SHA-256: c96eb5a30b9d213809d804104c2a37d7ac603314a6c8cbc0e07f7a67e97e034e

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