Malicious PDF — malware analysis report

Static analysis result for SHA-256 71480365c3494967…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 06:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80b727b7a9edbd83d7228821209b85d9 SHA-1: 4658638602e560cd1479ade45b5af416b180e12f SHA-256: 71480365c3494967d6e1b299d42b6756725f7a483739c786c9ff1e0a990fd919
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted from this sample, but the PDF structure and embedded links are sufficient to infer a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=the+sims+bustin+out+android PDF link annotation
    • http://printrun.nl/userfiles/files/30396653327.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/31253128851.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/19752685996.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/nifetupuweviner.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/59374041672.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/71440941351.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/vawememapizedonimu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3155800c3---fukapepu.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/pizuvagovimugeribowotu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/jopalevemolodido.pdfIn PDF document text
    • https://venus-forever.com/image/files/86102897604.pdfIn PDF document text
    • http://drironcat.com/images/file/rivotonev.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/55674327181.pdfIn PDF document text
    • http://k1a.ru/images/files/file/gadakisav.pdfIn PDF document text
    • https://esvigo.com/upload/files/47451331774.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/sovivipiwurenaponakuwos.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 18700 bytes
SHA-256: df9c32b7eba7c3743eaad0caefbdadea3c42434a13a344dd637ce8d28c826311
font_01_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 10672 bytes
SHA-256: 2c9486a0a124f3b212e7311416dea0edecec48840698c001945a4056a1bf73bd

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