Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d34d251c806663c…

MALICIOUS

PDF

89.5 KB Created: 2021-05-06 00:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 04ebced347955fb5e9ad435498d1fb84 SHA-1: d98668efc8dbb28f3e78b0a1b0f5790c38fc8d61 SHA-256: 7d34d251c806663cf1d16e4dc42cbcbd29e506f3af64a68f1e667285402aeaa6
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 0.9983

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://maypoin.ru/strik?utm_term=why+is+coronavirus+so+bad+in+illinois PDF link annotation
    • https://wipibafupegivu.weebly.com/uploads/1/3/4/8/134868488/4854158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_60568503eadb8.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/45cc41.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/4075826.pdfIn PDF document text
    • https://cdn.sqhk.co/wepuvumug/ajemjeO/5494644489.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/a5c5b1eb0ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5fe673b10c87c.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/06676b6766d4b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_5ffceff07817a.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/janokomojijow-pizekenodukuli-lekazap-miratugozo.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/konuj-kabukededenur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ffab2f171655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6017db832a611.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/ijfijkq/32554706249.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/gMhbgcf/castrol_grease_application_guide.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/wavadevases-vepozun-ropunopovoz-somatesojiva.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://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_df2aa3f0c4334e7f9b1d3c7a1582e7db.pdf?index=trueIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_45523d2a214a4137a67b11822ca70f4f.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_646f90d75d0944bb8834d5143dd7975c.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_9dd4c736dc5548f1b8927651c77ed45c.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_76c5680d4b794254ad93cdd8c264f788.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_c945a70872e342288cf8fd83a0f16db1.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_04097f98adbf485eb6e8148f1909d64a.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_f5bce6d5be274f4b8957baba74cd9362.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 4304 bytes
SHA-256: c17c527f8dc3e61e7fadecdb90874f33fd4dc647d937e6589505eede7e97d3dc
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 5024 bytes
SHA-256: dcaf4f0ed5982f4cc26cd3eaf074e79df46884eb7391764d0519e225a720c4af
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 11348 bytes
SHA-256: e9c19b29a30264522bb04a129957237d4e94c1a7901c3d8bb929c2553388f671
font_03_sfnt_off0001498f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333