Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f285b854b43ead3…

MALICIOUS

PDF

72.0 KB Created: 2020-12-22 21:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2058913cfd6a2edb6606297ebc267551 SHA-1: 0389f6d4fdb8e69a7c347ce9828eb2b80777a1d4 SHA-256: 0f285b854b43ead354568ee771b9c7de0d125d1ed69ec7619a772820972548eb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://traffine.ru/aws?utm_term=sales+administrator+job+template PDF link annotation
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/f4021eec9.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/2919675.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/zumokuwomazola_kadonufedaduz.pdfIn PDF document text
    • https://xefolulewonud.weebly.com/uploads/1/3/1/4/131406676/xonubasoxi.pdfIn PDF document text
    • https://bujubilefo.weebly.com/uploads/1/3/1/4/131406518/c101e1451214.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/3794325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5fa04fd006181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_5fb883e9e00cd.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/7531618.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://static1.squarespace.com/static/5fc37448e5c7695ca9abd32f/t/5fcab2217f32ab29bb7ce9f4/1607119395251/wyvern_ark_mobile.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdf3fd96394b41d6426e7a7/t/5fdf5868f3f88b619f1d04c1/1608472681849/masojovoredozab.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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 5212 bytes
SHA-256: ab5b511ae069aa66a4c41af52e15bbe393e1daefa27ccc4f5f0fc34459c8347e
font_01_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 10832 bytes
SHA-256: d141461d17cb9f08b5b0ef9246d6d0004bc3fa98dd328c54f15ec76636484a86
font_02_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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