Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e8ef14115eb381…

MALICIOUS

PDF

81.7 KB Created: 2021-06-14 14:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d2c43378cd06198455818ddaa2f9dd18 SHA-1: c6c8f344dc3654df61213ca6b826d16cc00d97cc SHA-256: d7e8ef14115eb38168252f6fbf31b0ec9be2e85378c86286ff050acc94a38f43
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious document, potentially using embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pistant.ru/pbw?utm_term=power+vs+force+summary+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393626/normal_5fe02eefb6aca.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/tibuponuwinopa.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/3623519.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/4a279995bdbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6027e3c75634a.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/30c867.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/2b70402585.pdfIn PDF document text
    • https://jikufowawuful.weebly.com/uploads/1/3/2/8/132814232/2660674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_603c81c3a94e5.pdfIn PDF document text
    • https://vamofelew.weebly.com/uploads/1/3/5/3/135398798/1806741.pdfIn PDF document text
    • https://pewoguliburutoj.weebly.com/uploads/1/3/4/2/134234653/37489dcad65e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60b90d5844a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6020299ab7306.pdfIn PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/gutofakagos_palalefepimox_rogodatibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_606c6fbcb6c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_60637865778fb.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/5b2cea83d520ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6056784446525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_605f6acbf40ca.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/bd12c45a-d4cc-4d61-a4b1-f7d274aa65be/gekikefawibejad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b29847e-71c1-4cd6-afdb-7622d1745428/what_determines_perception_of_colour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4e3e9b-6cd9-4505-b931-9438df1d5979/crazy_love_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c230b01f-2c70-4d90-839b-bc39e74ad10c/5775671575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df970df7-9227-4204-9b52-e2c93303b34d/i_have_a_blood_spot_on_my_eyeball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3538aea5-c886-4e63-ba61-266eff574221/71410713209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f47235-346b-494d-9d67-ff9e510d2c79/14987085525.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_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 5524 bytes
SHA-256: 63eab89d6ebe6b2af8ab30d8fb9c0078bf49a0cd2818631f816bd84573e048f9
font_01_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 10560 bytes
SHA-256: 97d8940312357923e125b0716338b8c82008186fe624a8bd43ae832edcf25fe6

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