Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f2b41c4edc460e…

MALICIOUS

PDF

81.8 KB Created: 2021-05-08 23:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ee7b630b5162cda084f0a0cd9e8b570 SHA-1: 65cf8142712b21a279aba7ef7226fb13031716b2 SHA-256: 86f2b41c4edc460ebf3f301827f2f12ce9866ccec6b60403e59b0832c8b6b687
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=quais+s%25C3%25A3o+os+tipos+de+mercantilismo PDF link annotation
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/bomovebesekopo-tivujesuzemina-tuwapubeban.pdfIn PDF document text
    • http://bonusiotsbera.online/shivyog_healing_mantrayvszh.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/negobidolimazu.pdfIn PDF document text
    • https://kuledeju.weebly.com/uploads/1/3/0/7/130775905/5932726.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/c44ce4f18a44.pdfIn PDF document text
    • http://greatholl.com/restaurant_7_steps_of_serviceyvak9.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://zorimiba.iblogger.org/english_stories_for_class_6.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/clasificacion_de_los_valores_humanos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_a067043870af4f5f82d557f3076b5c87.pdf?index=trueIn PDF document text
    • https://bc505e1f-552b-4a61-9a3f-bd25066eb794.filesusr.com/ugd/70c1f8_82be5ed8f4a341bb96172f31b0cd6380.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_7106acc8b12743a3a3759b36287b8fd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/xurovinabibawuto.pdfIn PDF document text
    • http://luzozizibaf.rf.gd/93561632504.pdfIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_c143b2ef608c402ca206aab1a5938075.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_094f969bf2db4d788c7e56c2f95e7465.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_fb4d402c5b984de3bbefd4b4874a1bf2.pdf?index=trueIn PDF document text
    • http://lizemafomur.epizy.com/framingham_risk_assessment_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/amadeus_altea_reservation_desktop_manual.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_49ca034e26ef4332889ecdea981b6972.pdf?index=trueIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_797f63d19c174dc0865d4d55556e4d26.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_475e6403babe42d785878686374e118f.pdf?index=trueIn PDF document text
    • http://xubufusizosawud.epizy.com/the_odyssey_book_5_annotations.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/jafugir.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_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 5596 bytes
SHA-256: 536d1ce0c325c838a8ed8ba8f3e7debf14cb01f947e7d24acc934b8bae049765
font_01_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 12944 bytes
SHA-256: f8d105b8a61856c58cd174c34eec3d4659531652cfe3b6563563bb07a7573d1c

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