Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6d21d9c06a7c59…

MALICIOUS

PDF

80.2 KB Created: 2021-05-18 11:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 56c66bcc3f9d2d014d27f7fba419ed24 SHA-1: b4c4609eddf43c20682da5aa7b0984b69eee9e0c SHA-256: 0f6d21d9c06a7c5993ac00e17397cad98dab70125d7c023b1bb4abe64613f9ca
194 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 of which point to disposable hosting services, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading malware via the embedded URLs. The presence of a 'download' button lure further supports this. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=critical+action+gun+strike+ops+mod+apk+hack PDF link annotation
    • https://reboxulowewo.weebly.com/uploads/1/3/1/4/131407709/571f09c358699a.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/bonifuzifanixiz.pdfIn PDF document text
    • https://gavufiwi.weebly.com/uploads/1/3/0/7/130775220/2927730.pdfIn PDF document text
    • https://jadomuvifaxa.weebly.com/uploads/1/3/5/9/135960305/zejemit.pdfIn PDF document text
    • http://kolomakive.iblogger.org/88792705225.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/jafaro_rigoxobod_felirakip_veket.pdfIn PDF document text
    • http://fojuzoxine.22web.org/clergy_appreciation_month_planning_guide.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/wapiw-kumisujumexaf-vafikexi.pdfIn PDF document text
    • http://tadenexibegujam.22web.org/palujosifozojefanigofe.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/porubomavelisek.pdfIn PDF document text
    • http://wegevuni.22web.org/global_distribution_system.pdfIn PDF document text
    • https://finiruxadaral.weebly.com/uploads/1/3/2/6/132680938/bogebi.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/zijalomero_bamajogorixeta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefaborap.rf.gd/18493722241.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bojokufetigikaf.pdfIn PDF document text
    • http://radulamuwufudez.epizy.com/beginner_java_projects.pdfIn PDF document text
    • http://buzawasilugije.epizy.com/bobawekemebifi.pdfIn PDF document text
    • http://ponogifivow.epizy.com/how_to_gift_chick_fil_a_rewards.pdfIn PDF document text
    • http://lizapulin.epizy.com/dejujugopapunawezudi.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/ruweselifaridawirotez.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/lord_of_the_rings_all_parts_download_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/best_compact_washer_and_dryer_uk.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/55802372963.pdfIn PDF document text
    • http://tumizasikoxef.rf.gd/vomip.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/aqeedah_tawheed.pdfIn PDF document text
    • http://segoxegigo.epizy.com/types_of_carpentry_joints.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/because_i_could_not_stop_for_death.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_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 5456 bytes
SHA-256: 0a2a05812cf9c446fb5785c0fd891e4ef368dcfbb013ba638bb79d1b4947c297
font_01_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 11468 bytes
SHA-256: 6de6aa46a608357321ab87fc83916c2952e92438be72daba7a04edcf9f5558dd

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