Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba88d61055ae1d46…

MALICIOUS

PDF

107.4 KB Created: 2021-04-25 17:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 029b65772d185f10567c9c2e4cf883e5 SHA-1: 574e79834600516123c78edf499842076ece4b66 SHA-256: ba88d61055ae1d46dedeb9e628a0f33971f1ff9d7919a25059b9bfb8a1169435
186 Risk Score

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 0.9998

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.
  • 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://resalured.ru/strik?utm_term=think+like+a+freak+review PDF link annotation
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/faxepepemef.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/0b0f9623becdd93.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/zusugo.pdfIn PDF document text
    • https://pajapuzewufivu.weebly.com/uploads/1/3/5/3/135305216/8d42a191.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/5759376.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/28ba1e873fae2cb.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/mupugirop_dojujeroj_nawufijelejaso_dilemunerusopu.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/reflexive_banach_space.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tizexazebubo.atwebpages.com/what_is_service_of_process_new_york.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_c9764d0ba27340d5b0eeab3187cda251.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/41229181767.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_52230e4819f54135af675f6e017d76cc.pdf?index=trueIn PDF document text
    • http://ratobewiwigu.atwebpages.com/biosurfactant_production.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_23c7fc9b083240ae95d145c5458cce09.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_9e880ae74a2f4ea89d269e26db1cb9da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/the_purpose_driven_life_day_18.pdfIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_88684d4ee666489685d6b53ccd1960fd.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_0fa98c73da63469fa48c96cf87299417.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_6dc45e93770f4c3b8d982c0819565374.pdf?index=trueIn 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_off00015c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C78 4844 bytes
SHA-256: beff500caec922cc6de96d8d8cd6ff2c9bef4a28b4a73bd74a397bc95ead4bb2
font_01_sfnt_off00016cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFF 16976 bytes
SHA-256: d037a519c41df1e822fbb07a84903c1ee3e897cbb2711930fa74c80690336083

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