Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd34ad1fd0e5049…

MALICIOUS

PDF

69.7 KB Created: 2021-02-18 23:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3265276a8cf5d3ff6355ec7916a7024a SHA-1: efd94ab951e661e027bf873f05221e6f8a02acb7 SHA-256: 1cd34ad1fd0e5049454462553e607b58d60548eb08aab2576a449feb104cf5cc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=grammar+worksheets+sixth+grade PDF link annotation
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/fanipita_xafikoroturo_jogovivixamiwo.pdfIn PDF document text
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/3677512.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/fimodideme.pdfIn PDF document text
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/8b133fbd4b01136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_60050dffc8300.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/vinodusibamin-rabituwobiro-peruv.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/h3OJiij/39649281675.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/b6458bc9f3a64.pdfIn PDF document text
    • https://fobepomakiroka.weebly.com/uploads/1/3/0/8/130874330/d5910f.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/igjigcJ/lazigudutepe.pdfIn PDF document text
    • https://rivakevalitute.weebly.com/uploads/1/3/0/8/130813818/basuwu_xorikomi_fewaxezafixowu.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/7918345.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/kovozenamofox/xigukararamopu.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/vokoxapawewatuzadaboxow.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/causes_of_food_adulteration.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/40372627896.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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 5464 bytes
SHA-256: 5b7b17307975eccb7ab574381bbfd137f5e4b8b1cb3886677644d934cb395bd5
font_01_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 10056 bytes
SHA-256: 931bb89af33f4783df8b5922afcec28fb4519c89a623830bc0e2bb879b24b32d

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