Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c495342c9c5054…

MALICIOUS

PDF

80.6 KB Created: 2021-04-07 03:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fb5758a773a0f379c0f00a2a66b4758f SHA-1: a891ec5420c99eebb09f42a064f2d7106a934945 SHA-256: e7c495342c9c5054b80a25b4b60c803d02dc1c525254f7053d707edf1e93148e
194 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://ponafet.ru/award?keyword=auto+repair+and+maintenance+book+pdf PDF link annotation
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/3689abc2.pdfIn PDF document text
    • https://cdn.sqhk.co/lufasawo/gficbjc/mopikogidiza.pdfIn PDF document text
    • https://bifupepazabar.weebly.com/uploads/1/3/4/7/134740405/tujamu.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/49918c3aec260.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/vZihgds/lozavekamononujukibup.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/cTCjhzE/4058503862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479673/normal_600916b61e1c9.pdfIn PDF document text
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/fopisu.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/ow6iL38/fegotif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506131/normal_6000827f31e9e.pdfIn PDF document text
    • https://gazetitorujij.weebly.com/uploads/1/3/4/5/134599815/sopibiwepevibib.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jzcdheh/50323851338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fc65d56e1414.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/oQzqUjb/6407622789.pdfIn PDF document text
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/2578ee032efe30e.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/fnjdDHi/off_road_dirt_bike_riding_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sojebelevenex/venaza.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/ridoli.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/12th_ethics_new_book_volume_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/tedosevonazapudaxun.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/affidavit_victoria_form.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5168 bytes
SHA-256: 5232b728534ef769f9105711a3a958d1543ba01c79c2fe78ea8bc0c311acf4ae
font_01_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 2268 bytes
SHA-256: 2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349
font_02_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 11124 bytes
SHA-256: 20b962e60352ef77fad4a5c5a26156375673b33f602f4647a0e01ce0fa0d3a64
font_03_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378