Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e156f1158ed538…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 23:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a0e413db787f4c794b669cdb7e5ebed5 SHA-1: 2cc23e90a56b0b40de3d6b5e4fc1180baa64409d SHA-256: c4e156f1158ed5388388a77008a434df861b10645c856fce395c96401f709184
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous suspicious URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdf In PDF document text
    • http://iucecb.com/files/file/74627453394.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/14187247364.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/93546106338.pdfIn PDF document text
    • http://ahknchem.com/upload/files/69937487486.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2bb10c7af2ff5c80b11d111b9152c898/68578302473.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jenigina.pdfIn PDF document text
    • http://konberdbio.com/upload/files/7978812524.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa69dddfe4---14529335901.pdfPDF link annotation
    • http://frigotechreina.com/userfiles/files/bakeliponogobafetilanub.pdfIn PDF document text
    • http://www.pilartangguh.com/file/89569419371.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/62129861654.pdfIn PDF document text
    • http://headrepublic.pl/images/files/8971040884.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/93710206622.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mabebetiwekegiruwogu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/47062860325.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/3872144704.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99009859487.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/12753114708.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196120518442.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/69697399760.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cc9cfd09995dc072d23fef365a28ca2d/32322631969.pdfIn PDF document text
    • http://klinok-saintp.ru/files/86565068434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=final+fantasy+gba+romPDF 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_off0000bbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC8 16340 bytes
SHA-256: 9930aa0c85dffd1e97658cddce832b0c795c36476c2b9fb7b705a4f2a613359e
font_01_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 10656 bytes
SHA-256: 5bcd7fd84b113738a22381603f9a8bb0452ea3703e1b8be46f94d00f96f43dba
font_02_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1