Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cfc3962c5a1bb7…

MALICIOUS

PDF

74.7 KB Created: 2020-12-23 15:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c623422cfce5abda30c14031b57cd945 SHA-1: 6e2507178823f903ee3f79fbe4373d6e2fb3f2ac SHA-256: c8cfc3962c5a1bb7fa1a1c1ea6741d5b44bf4de40eac811783bef6ff714b03a8
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with heuristics indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and multiple links point to disposable hosting. This strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://gettraff.ru/123?utm_term=kite+runner+quotes+about+baba+and+amir%2527s+relationship In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fdc6e465b8d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5f9308ff3d6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5faa16fa334cc.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/5031915.pdfIn PDF document text
    • https://zopupafi.weebly.com/uploads/1/3/1/4/131454349/vijepa-majegububaj.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/wuropu.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/dodulujiwipejubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_5fda44a99e414.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/fuvogunoberazelebabe.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/zibiso-pefiwopojix-juromadofiwedax-gidalev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5fa4aefd6efef.pdfIn PDF document text
    • https://jozifopavix.weebly.com/uploads/1/3/4/3/134355896/e9f63fda66febe.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/25bf2c67-a079-49e3-ac52-4ae04572e80d/40497978789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad7077cf-f208-4e91-bf6b-4c517aed6fe1/20652090116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb29797-4909-49a3-95db-be5dc8c92936/liwitijimiketebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3310a2d8-311b-4eb0-806e-c46db3fc8d6b/c207_task_2_chi_square.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5468 bytes
SHA-256: f80e31ce20d9c14e65dc435f7ff02a4bce96d32b53ea95bc70c22c4878928093
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 9976 bytes
SHA-256: 8917fa5b67744c5288a0b808901b28c46999405a5685371fadbd292be97fca92

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