Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c79401bcdad521…

MALICIOUS

PDF

81.2 KB Created: 2021-01-24 20:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a21d8e03f4227beee6abc65bcce8c353 SHA-1: 2d388959e689828f471ec4ac7c205b85714f8d8e SHA-256: f4c79401bcdad5215cc05445deabbcf61b0b9865ac396415c1e0457710b7cf05
192 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://yafferge.ru/wb?keyword=pakistani%20chat%20rooms%20free%20registration`. The document body, though heavily obfuscated, suggests a lure related to 'Pakistani chat rooms free registration'. Heuristics indicate the PDF is a link farm on disposable hosting and is flagged by an ML classifier as malicious, aligning with phishing and redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/wb?keyword=pakistani%20chat%20rooms%20free%20registration In PDF document text
    • http://saudiautoinsurance.com/new_mega_man_mobile_gamem1p49.pdfIn PDF document text
    • https://wubeponasi.weebly.com/uploads/1/3/1/6/131606197/f2af713ac694a.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/3454415298.pdfIn PDF document text
    • https://limavewudadeku.weebly.com/uploads/1/3/5/3/135323498/tiroxawoxunafuj.pdfIn PDF document text
    • http://civiliscmq.online/99008656524y4efm.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/dujisob.pdfIn PDF document text
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/5326448.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/toto_africa_chords_piano_sheet_music.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/xakusineba/19172969979.pdfIn PDF document text
    • http://fidotetunuxezi.epizy.com/acknowledgement_receipt_of_documents_form.pdfIn PDF document text
    • http://birotizedu.epizy.com/juzanisavipul.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/google_hangout_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/kevosasuwaz.pdfIn PDF document text
    • http://nokolul.epizy.com/19654291373.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001137a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1137A 21588 bytes
SHA-256: 31968982811761f379c0ef17ca9d4ec77d361163007b9665510d9575e31db25d
font_00_sfnt_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 5328 bytes
SHA-256: 416fcaa722ed0b966053fd2e12a4627cbb73d532bf5126f1f935952f6655fd44
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 9496 bytes
SHA-256: 43642a786355524a0f754ac0effa19d6cbed68e0625764e6083498b66194b03e

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