Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb9fe77c35d76df…

MALICIOUS

PDF

77.0 KB Created: 2021-03-13 16:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b87a02dadd2346439fe7725637adb059 SHA-1: 65ddd8f1f21de095fca8a58d36116a04d6036c90 SHA-256: 3fb9fe77c35d76dfe7b081baa15df1544fe35b3fda2f371b6d51e2868155df9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to Weebly and Amazon S3 domains, suggesting a link farm or SEO poisoning tactic. The primary malicious URL, https://botokaw.ru/strik, is presented in a way that mimics a search result, likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=what+size+is+30+x+45+cm+in+inches PDF link annotation
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/5168367.pdfIn PDF document text
    • https://nugonerikol.weebly.com/uploads/1/3/4/8/134883066/8eb1d446f186.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/xanolevenosamesov.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/mukixedulizatu-jefudoki.pdfIn PDF document text
    • https://derifopo.weebly.com/uploads/1/3/4/4/134490925/lozokujipojo-jovutoniziv-selaxe-kagebuduwedeze.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/1811806.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/kumagutumazupu.pdfIn PDF document text
    • https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/cab33e.pdfIn PDF document text
    • https://dajadigab.weebly.com/uploads/1/3/2/7/132712332/gudakoropitu_buvasinodijilo.pdfIn PDF document text
    • http://normab-id.com/tiwivibuvokobozudadd3w7.pdfIn PDF document text
    • http://cosmeteca.com/celestron_nexstar_6se0lxks.pdfIn PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/zawoguvepavirulajum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/mary_poppins_returns_disney_plus_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/ridukoxavelamafo.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_1da4a21455ed4a06965553affe018486.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/centos_6._5_iso_64_bits.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/betfair_sports_betting_app.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_477fc64d428143678d3b9a841a11412d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/armitron_watch_price_philippines.pdfIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_a654447d23b842b4820160efc137ef09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/alexander_publications_distribution_transformer_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/what_is_the_best_book_for_marketing.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_1054392a626440498fb167ebc46f10a0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5560 bytes
SHA-256: 6763984de4ae5359b56a096b71dbd1f0e567ca32a94db725234cbc73a9468c53
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 10276 bytes
SHA-256: 5af231f9255e65eb39f474e84ca2558d9454efb799d02ef0f16fc11b43b0e611

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