Malicious PDF — malware analysis report

Static analysis result for SHA-256 d745652ca5845416…

MALICIOUS

PDF

76.8 KB Created: 2021-05-17 02:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 02194c3b6a561a1c6c90d8b22595ae10 SHA-1: b64b5ef577d3704a8e0307434be1ccbdddf96ecd SHA-256: d745652ca5845416cd21806b6f3d2b646813642b43e6e99dba5b74a308a4b894
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting a phishing or malware distribution attempt. The primary malicious URL identified is 'https://yafferge.ru/strik?utm_term=mag+one+bpr40+radio', which is linked to a lure about alarm system instructions. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/strik?utm_term=mag+one+bpr40+radio In PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5fe0d64c4c2da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_604dadb9b636b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6032cb09f2954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_6064630adce8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fd3b2258a9d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483071/normal_6057b0a245f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406812/normal_601a267aa9f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_60613aa90c7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_606c1eec57625.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/ganubifirigevi/how_to_turn_on_my_adt_alarm_system.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/father_can_you_hear_me_tiktok.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_a1caab0f03814782a27fcde5d20373cd.pdf?index=trueIn PDF document text
    • http://zegemipufe.epizy.com/aviation_industry_overview.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_5031a53033004c35a7a7fb7f8e174bf7.pdf?index=trueIn PDF document text
    • http://duxurulokij.epizy.com/vowepij.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5000 bytes
SHA-256: e4c3b7d0ce3f7090e4179081fb7a0c000ee73f9bbaab93afa4a72f1eca7e6a40
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11060 bytes
SHA-256: d5c86ca191b961d3abea8488a5fe747212e49e4735da08fb2e695415c593028f
font_02_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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