Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e1561edc0d0d59…

MALICIOUS

PDF

80.6 KB Created: 2021-04-02 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76704c62e6fa333a10e3b1d34358ae87 SHA-1: b1d9d35a609cb482548650e4ceaa823e0527ae88 SHA-256: 45e1561edc0d0d591d6da396bc2cb2adf53b39ba2f79ccf9e9971188ce60b9b9
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 0.9995

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://lozipotod.ru/strik?utm_term=list+the+rules+for+writing+scientific+names PDF link annotation
    • https://tosofeguwus.weebly.com/uploads/1/3/4/3/134321705/derokigoxozozaj-wabubezes.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/behaviorisme_skinner.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/87652486134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_6035f6bd4a921.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/mopaxiro-sujowitolagipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5fdf621bef83f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454287/normal_5fff272205f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_605231471791d.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/drawing_right_side_brain_workbook.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/kidemijolesuxapenupewek.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://uploads.strikinglycdn.com/files/164eb534-d4a1-48a9-ab08-b3ca5e90e7fa/56446704034.pdfIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_e4e84a7e449c403f92d3c2a433431af9.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_a9d286b27f25477cb3a5946df1bf80b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba036b5b-38b2-48c5-8527-3f0fa24fb0bb/one_minute_cure_reviews.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_af04f0b135a24c3d90762cb589136474.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8310299a-3c6f-467a-85e0-71599aa525db/the_death_of_koschei_the_deathless.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_fef64d67205d4de29840e1e24a3b1cbc.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_8a56b3551f2d4a62bc2c2aa57b508892.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_eb92a02810074dc49d18fa704825d064.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_92a4f032e94c4c8481e800f9ad72f9e0.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_a60f8f583ccd4fa0b3223661b5a9eecd.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_d559258073a24cc88f0abf12cf2d66d2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 5208 bytes
SHA-256: fdf8e75b62158f85b33bda29bc4b0aa491b306b5921874fc86b531a15af2459b
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 11636 bytes
SHA-256: d208a5c7f22acbcd4eea058b6b7beb015a193eb6e29b466ff64465c057b8b03f
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2