Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da4f8d6bd0d2aaf…

MALICIOUS

PDF

81.6 KB Created: 2020-12-16 20:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fd271aa4fbd25f8f8366b4eb2ded7a67 SHA-1: 9dd77c3d31d05c80f2ae7a0f2b68f2613e721df9 SHA-256: 8da4f8d6bd0d2aafe3eb98e831c7a971af221c7127bd8005b470f1b1e9b425f9
216 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses brand-impersonation credential phishing. 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 0.9996

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/zixus.pdf.
  • 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://trafffe.ru/strik?utm_term=financial+accounting+10th+edition+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407789/normal_5fb4f31c06921.pdfIn PDF document text
    • https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/zixus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/dictionary_english_to_french_free.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/apple_pie_apk_similar_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/zolurivimox.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/57683897026.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/46497513618.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc009dd8787e87989674e7e/t/5fcbccf3b495bd20282ae346/1607191805974/gtr_traffic_rivals.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/drusy_quartz_ring.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3205912facd59cebb7138/t/5fc39e3a61e25426e1a6de42/1606655547162/roxbury_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/vesavuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/123d_make_alternative.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfdd38a3bf4b14aba341ea/t/5fc5d117645712565405b2a9/1606799640774/93236670784.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 3220 bytes
SHA-256: ea6cfdff31f1e98d58ca3ae349873ba2b6eede12e5c7ef43da344e849c0938e7
font_01_sfnt_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5384 bytes
SHA-256: a19cd6874f5d50fdc22c35d5be611f3cfe18fdc8a0f8b7b866676530210f44d6
font_02_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 7980 bytes
SHA-256: ff15faa0058a812e7e5831b9df531a1b58401c386cbefea1b6b6063f2056b966
font_03_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 13384 bytes
SHA-256: 5a1b1c3d48d59a6e30258da33a02b8093d3c1b43bf0567c89c3a608e2a7aa9b8

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