Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aed154a22c13f85…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 06:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be5c123fe9a5ad71fa2305fe34546d0b SHA-1: fe1117daef6d12dc61f5a5d95af3a99a2abd33a7 SHA-256: 1aed154a22c13f85d55f1320ce783dbe26895324a7e9863f5bfa01886cc67900
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly associated with phishing or malware distribution campaigns. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection verdicts strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • 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 http://prompol.com/media/file/24795094956.pdf In PDF document text
    • http://abwingsva.com/uploads/files/foxizisu.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/lisexezarurovugatap.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/nowepoduxisagejuxerij.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/58269295696.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/lemufejirugunotudokel.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/85260381705.pdfIn PDF document text
    • http://saydersan.com/firma/files/20143295459.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/2841176404.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ffb447336eec1c63fc600cc6e03a2591/wolovatumemitofifoku.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/puvetasituvo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/sovakegepelu.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/bepovoxisobewo.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/70332130093.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/43605684155.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210912_63C6AB45449A049B.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/pazipowasi.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/gumanesarirerigurute.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/9737219577.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/79558914811.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/wowalabinatolosipukuzu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/rolisasijatemibomoseru.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/43265391498.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/68710723404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+downloading+app+apkPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10616 bytes
SHA-256: 8b2f270eaac7f7048c699cd6cdbf7cedadd4e8e794648032ec2a84a34d24297c
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 17488 bytes
SHA-256: 070d1de545d872635ec81169ccec0eb73f55366b69a2204b894e3e35c2afbdcd