Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f3f382fb0ee4ca…

MALICIOUS

PDF

71.8 KB Created: 2021-03-14 09:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c199f5d5bbdbb114173eeca559cec561 SHA-1: fc5a1a465626dcec18c2be33dfff3d2b99e05346 SHA-256: e1f3f382fb0ee4caff2e7f517575b9767b79e25341cf289ef773bbe3c5e05448
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The embedded content appears to be malformed or obfuscated, but the primary malicious activity is the distribution of numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=dell+2007fp+vs+2007wfp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458394/normal_5fd68aca775a5.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/repogolorivudireg.pdfIn PDF document text
    • http://begemotiks.fun/birthday_wishes_for_boyfriend_in_sinhalag5jfj.pdfIn PDF document text
    • http://pochta-24.cc/kanozijor4clm.pdfIn PDF document text
    • https://fulesinarube.weebly.com/uploads/1/3/4/7/134729099/guxupiwigexi_sasogaj_getiduminow.pdfIn PDF document text
    • http://taxafig.66ghz.com/74905783007.pdfIn PDF document text
    • http://bijibibisugas.iblogger.org/options_playbook.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/821971c4bd78a.pdfIn PDF document text
    • http://alcexpress3.xyz/25947702037aq4o9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460950/normal_601edbe28e4d2.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/7307899.pdfIn PDF document text
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/jijirupedewap.pdfIn PDF document text
    • http://narezekopalezi.iblogger.org/56067786578.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/adc1706.pdfIn PDF document text
    • https://wutifanuviwi.weebly.com/uploads/1/3/4/0/134041095/welopogofuwu.pdfIn PDF document text
    • http://8gusevshop.website/shovel_knight_toaderrzv35.pdfIn PDF document text
    • https://vavulawukuret.weebly.com/uploads/1/3/4/6/134690424/faf8e8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed7e9d3-e4be-4a43-a37a-c5aa29a7b749/matlab_for_loop_multiple_plots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c671e39-03da-4e5b-8884-04a64acc02e9/sims_3_vs_sims_4_base_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52492434-1d1e-4adb-94b3-2b89c35172aa/pewufaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee48cab-a24b-41bd-8738-09ca638ebc1c/masterbuilt_30_inch_electric_smoker_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44e297e-5c30-4035-8894-6fec91bb5cb3/axial_racing_scx10_ii_2000_jeep_cherokee_rock_crawler_kit.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5092 bytes
SHA-256: a286d2f9e03935ba0fe1857c5211a4981bf027bf1ea38ab567e1b7353cf0a89e
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10580 bytes
SHA-256: f37f060b3d06629c839acf2d9595d67fef13b027840ceb572ec1d086b26248fc