Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d157649cbed231…

MALICIOUS

PDF

67.6 KB Created: 2021-10-02 19:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44bd3cce0db664d6d4ad31493f997724 SHA-1: a22787db3b1909f654f0690d53a93e1a49e1ca69 SHA-256: a9d157649cbed2313166fe59a426597b40d2f61d3895fb20bb2abcca818b3cbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is `https://allytemp.ru/uplcv?utm_term=ppp+meaning+loan`. The presence of embedded URLs and the link farm nature strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://allytemp.ru/uplcv?utm_term=ppp+meaning+loan PDF link annotation
    • http://whipitleather.com/userfiles/file/kufitapo.pdfIn PDF document text
    • http://hydrem.ru/images/file/jirirolu.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/fawasixeraganumo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1768636bvpqv6jhs61b4d4f7m7/jupomawalerasifap.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/sazomeniribusepabusodetal.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/vavarudaka.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/65064272772.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/fugaruguzosamuxurogela.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/54c3c9cb7b8c13981cc8cc3dba38970d/besaten.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/93472456365.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/95634357839.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/14209894657.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/tapelakojo.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/1616226913.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/vitekisiv.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/11221620054.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/39918633321.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/pesagesobutifuvefov.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/lesedefuserowatidonala.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/53099809577.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/66701572869.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/72697479090.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_off0000ad1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 10232 bytes
SHA-256: b387cef340e55cf1dbcf3af46ee38ada815414e46c8f58921c97a9c0b9e4461a
font_02_sfnt_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 14952 bytes
SHA-256: abbfe33b024d8cfe49839e6f14da4351e0d91b995434f3754d8dcb3dc39d94da