Malicious PDF — malware analysis report

Static analysis result for SHA-256 6109931bf74d15b0…

MALICIOUS

PDF

91.0 KB Created: 2021-05-05 20:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 95d0ccc19301d93f83a74423f03acb2d SHA-1: 685657704dc893bd27ae1489d3f2729593481581 SHA-256: 6109931bf74d15b0aa166e09a83b259c3cf312fb6e8c0a95a15aee66cf9c08d5
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, identified as a link farm. The document body, though heavily obfuscated, appears to be related to medical search terms, suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution via the linked sites.

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://baarspo.ru/wb?keyword=what%20does%20coronary%20artery%20stenosis%20mean PDF link annotation
    • http://galoomer.online/astra_safety_razor_blades_reviewgljlt.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/1782eed1b7c8e.pdfIn PDF document text
    • http://kekasot.22web.org/binks_model_69_spray_gun_manual.pdfIn PDF document text
    • http://216tilford.com/susidaosc9.pdfIn PDF document text
    • http://batmbatm.ru/number_pattern_worksheets_5th_gradeek96h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489599/normal_604fd73c84fc6.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/908765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_604d33e511b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_605baa5ccddfb.pdfIn PDF document text
    • http://nalodorepuwag.getenjoyment.net/tafisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424630/normal_5fd77d47375e9.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/dunkin_donuts_low_calorie_iced_coffee.pdfIn PDF document text
    • http://curvepreloved.com/raraxolugawanomubetolojajy66gx.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/lateral_thinking_creativity_step_by_step.pdfIn PDF document text
    • http://dkblogin-de.com/a_stolen_life_jaycee_dugard_free_dow8nwwo.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/90112657558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601b3583834f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_6005fa6e03154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowegasobufur.myartsonline.com/gitafejafujigoxakigox.pdfIn PDF document text
    • http://kidured.epizy.com/wuzewomefopixibi.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_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 5264 bytes
SHA-256: 8f3e92d7d9d7e4205e1fdec07859b6744dbf3a7ed122e3283194a1c300dd5a95
font_01_sfnt_off0001381b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381B 11416 bytes
SHA-256: f07b89987c4744e86cf29ef0f3d64ce4ca8320ce35d64e0f3b97fa5b11bd52c4

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