Malicious PDF — malware analysis report

Static analysis result for SHA-256 105ddacbbc68a56e…

MALICIOUS

PDF

74.5 KB Created: 2021-01-06 01:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 384b25ee79a46a2271d6fa011f3d46d6 SHA-1: 9e13c155945c9fb67c3205d0f0e689fe9edbcffd SHA-256: 105ddacbbc68a56ee075808f0ef1c17a8048c8affcc646ad8aa69fd8b4f76764
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search results or redirect users to potentially harmful content. The presence of embedded URLs and a ClamAV detection for 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=guild+wars+2+domain+of+kourna+poi PDF link annotation
    • https://jowadukezivi.weebly.com/uploads/1/3/1/3/131379295/9603000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5fdb6d766c2d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5fa89bd302a10.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/diegejb/joduruzuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8e0ee812e2f.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/6117676.pdfIn PDF document text
    • https://cdn.sqhk.co/wagavoketi/gTnibja/battery_operated_votive_candles_bulk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_5fa529ffde7eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5fe462464f808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f873fdcbec1b.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/32gjMgd/solar_smash_free_chromebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fd31489381a7.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/1sv5UzN/can_am_defender_hd5_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5fa229701605f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 5504 bytes
SHA-256: 51286667de172fd9e9f8a26dbbbf334913f45862cebd30af90de52548932bcdd
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 10756 bytes
SHA-256: 1cf32c33bf41e4924d6c79fe8d87a821f69290432182f390b9547da911adb519

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