Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4047a95d3f02a54…

MALICIOUS

PDF

68.4 KB Created: 2020-12-22 15:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 70bba8f968a08ff0c10e8063cbdb4adf SHA-1: 617bc7d1af6127183804ef916fcc5fd051e27376 SHA-256: c4047a95d3f02a54bc96326d11716c0867d89cd2444a74a6a613ad68d5536aed
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to direct users to potentially harmful content. While no scripts were explicitly extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://ggtraff.ru/123?utm_term=characteristics+of+life+worksheet+middle+school In PDF document text
    • https://static.s123-cdn-static.com/uploads/4371247/normal_5fca03ed8b78f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405953/normal_5fb2f91c40703.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/3360831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5f8a0f1247740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f8a92235da61.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/rakojosejekenu-limubexun.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/6625f6be2aa.pdfIn PDF document text
    • https://woviximanikiz.weebly.com/uploads/1/3/4/6/134693880/tuxizaged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_5fbe627c5895d.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/0e7b959c-96cb-4e85-bc62-f4128ad95098/xisozoromukaketiwiwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1d9c56-5f05-4e5f-b5df-de0b3e96f693/gokipawuxusila.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/4870751576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7929c8c1-3eda-429a-b78b-041f36099ad1/94002630255.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/what_heaven_means_to_me_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb9e545-14ac-4e2e-bdd6-1e831a992292/skyrim_familiar_faces_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca862415-2e22-425a-b07a-904ed96634e8/onii-_chan_wa_oshimai.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_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 5324 bytes
SHA-256: 404d6f4b46545465107bc9e491953fce9b1723dda378a0dd65c600d01d2da8a0
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 10420 bytes
SHA-256: 3560a34c0eb90f68592fdb123cc728d85db0eadd7c54279a58cb91a3fc857b87

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