Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bc2dbcc8fdb68f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 15:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 938c3ce851085985baf5fe3020cf7bac SHA-1: 6eb62e07775ef2e9ea262e8137cd67d808868cc0 SHA-256: a4bc2dbcc8fdb68fcee6acaf8e1e1b056b660a4d831042227b9b7b2dbb2ee7dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, characteristic of a link farm or phishing campaign. The embedded URLs suggest an attempt to redirect users to potentially malicious or scam-related websites, disguised with seemingly innocuous content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=attack+on+titan+characters+season+4
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/genidoguwivoxo-jojuvizezewaw-petazosas-fumaxesus.pdf
    • http://lilubaxubaxulu.sportsontheweb.net/zekiwipezidapomekazif.pdf
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/86e4e5a5.pdf
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5fef38e75539a.pdf
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fc9dae95e6ee.pdf
    • http://ketousa.site/solifomexmfe9p.pdf
    • http://pubgmobiie.com/posumunubifoguse8w7b2.pdf
    • https://jafadunew.weebly.com/uploads/1/3/4/6/134632108/cc64687506e81.pdf
    • https://wowutelugige.weebly.com/uploads/1/3/4/3/134359508/ad3687.pdf
    • http://rating-bookmaker.ru/used_troy_bilt_tillers_for_sale_craigslist2ugb5.pdf
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/324a7.pdf
    • https://cdn-cms.f-static.net/uploads/4405190/normal_6057ea039c00c.pdf
    • http://vamefegali.mywebcommunity.org/social_media_marketing_agency_business_plan.pdf
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/133327.pdf
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5fc76f67c064f.pdf
    • https://bedexupef.weebly.com/uploads/1/3/0/7/130775630/4688998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://megugasawixige.onlinewebshop.net/11922522239.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_5118faa4703742afbb80ea70b715420f.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_593e097b448045539a659e7f37980f1f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c8.bin
6b5dbe434650cf39411d51af4ef38db2c5d3617d14b665543fcc0f3a4062dc47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 4996 bytes
font_01_sfnt_off000102c6.bin
0738ce1e1816d76f6571f05434fd83c21909c3455f00300a9b1f7736234c2cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 11404 bytes

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