Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35802a07da6e733…

MALICIOUS

PDF

105.8 KB Created: 2021-05-31 06:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 643a97d2fbfab316b4ca1812e0d23405 SHA-1: b7c19e39dfe24cd4a8c109c0eefe573ae2cf6979 SHA-256: a35802a07da6e733c25cc29c84e777424e4a55c5021348fd45c6977d50bb38a0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's apparent purpose of luring users to download content are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=pharmaceutical+marketing+brent+l.+rollins+pdf+free+download PDF link annotation
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/kokedujekajap_nepufuveredir.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/f6495dcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5fe4f09178c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fe956ae95e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_602616487b77c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5ff4d61aa0fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_604b4a1581828.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/6758008.pdfIn PDF document text
    • https://wipibafupegivu.weebly.com/uploads/1/3/4/8/134868488/zotiwopividutu.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/wanajojuwo-xosenobikos-potukunoxa.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/4fc76b756f7.pdfIn PDF document text
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/rebiviv-lewuzijadajujax.pdfIn PDF document text
    • https://mujilaku.weebly.com/uploads/1/3/4/3/134389228/lutadovajo.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/jarakunowok.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/gonud.pdfIn PDF document text
    • https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/biragemok.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/148a020b-22cb-40ab-8cec-826ec71e97c1/94924931467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53c816b-924e-439c-ab2e-ce0804f22194/95459276571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12aa68f9-4982-4834-817d-0cf7cce9a4e8/jeweravorafezojed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b346ec-4b60-4a22-93f8-8a9c3ef0ff13/7119995304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ee6c57-5d6f-496a-a22e-d161a337bbf8/how_to_replace_lnb_on_sky_dish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a1f1e6-eec6-469f-9273-0e42ea2d0b65/how_much_does_it_cost_to_get_scoliosis_surgery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cf1eac-a415-419c-b4ac-6153db11ff0d/witchcraft_oracles_and_magic_among_the_azande_evans-pritchard.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001483b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483B 5896 bytes
SHA-256: b4682bfb3707313b52930c68e50366f222219b38f3ac14fb621828e728be19dd
font_01_sfnt_off00015c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 12244 bytes
SHA-256: c09db6d950db380f8bd633e23590f761cb896e9967f1a3bd7e5e81a7c0539531
font_02_sfnt_off0001839e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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