Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73b5941a9d6b102…

MALICIOUS

PDF

78.2 KB Created: 2021-05-13 14:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a6d2f56d6c60a47e67aa6ee2b8110b8 SHA-1: c58e5c0bdbf49c4876f928a0f9dd65d0379ea37a SHA-256: b73b5941a9d6b102204e5c999e82ee040e2d069b351f0ad04b874afecf814edd
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets and a domain associated with SEO spam and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and PDF_SEO_UTM_REDIRECTOR_LINK specifically flags a lure linking to an SEO redirector. ClamAV also detected this as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure suggest an attempt to direct users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=business+development+manager+salaries+uk PDF link annotation
    • https://sezitoxonuga.weebly.com/uploads/1/3/4/8/134886233/7146404.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/tubujoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/PwTwngf/life_application_study_bible_nkjv.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/RdihXji/brawl_stars_star_park_theme.pdfIn PDF document text
    • https://bevizopet.weebly.com/uploads/1/3/0/7/130776142/kokageseriweke.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/h4S5Rws/nejaxetu.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/paxunu/what_does_it_mean_when_smoke_detector_flashes_red_light.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/fitoko.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/51182982880.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/softonic_android_app_free.pdfIn PDF document text
    • http://redejepivu.rf.gd/kamavi.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/31875213815.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/butterfly_effect_2.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/38184864397.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/news_nation_wgn_liberal_or_conservative.pdfIn PDF document text
    • http://xuxixezatazifax.epizy.com/9575983627.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/jiluxaxuvasuparipefabewe.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/24777720739.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/bismillah_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/dufuzedegofimus.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/brucella_abortus_tratamiento.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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 5452 bytes
SHA-256: 66630e8f559af68241c5484981854261cf68535ac30130e8b78fdc8549ab6ef0
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 11072 bytes
SHA-256: 7b6dcd322c720e13ef1f709ec0337e5512b39e73b562bd08ce9c2b07184d3b56

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