Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcf6ab88172ad71…

MALICIOUS

PDF

82.4 KB Created: 2020-12-23 12:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6467e8d0cf30595a5215ab91ca6276e1 SHA-1: 794e24bcfc0f054745d0e95114c2340932c9b305 SHA-256: 7dcf6ab88172ad711f404503fd526339fd56b9afd91c972d57a22704c919ad6e
216 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a critical finding for brand-impersonation credential phishing. It contains a mass of external links, many pointing to redirectors hosted on weebly.com, ultimately leading to phishing pages. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the phishing attack by embedding numerous links.

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
  • 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://papunagaku.weebly.com/uploads/1/3/1/3/131384156/3741780.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://traffnew.ru/123?utm_term=sap+outline+agreements PDF link annotation
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/3741780.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/kakegibefokow.pdfIn PDF document text
    • https://jowakalol.weebly.com/uploads/1/3/4/4/134480841/393858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fc716594f72a.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/4470634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f8e25e0bc49e.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/wejidafisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_5fb4f92ecab26.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/nopesexesi.pdfIn PDF document text
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/890f2.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://s3.amazonaws.com/farezelof/download_wifi_master_key_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/jodeteg.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/har_har_mahadev_3d_photo.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/modern_family_episode_guide_9.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/94903018153.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/systolic_and_diastolic_heart_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/gigabyte_x570_gaming_x_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/bagatisekajemiwefewok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 5124 bytes
SHA-256: 36e427a63a154c858f190221a15d03009e75d7bc4c1f72051829762eab70920b
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 10728 bytes
SHA-256: 089576fa714a0fe88e29fa816d6d6c512581151f1ad2ff0e5a392e60203072d3
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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