Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a65b1934063fc0…

MALICIOUS

PDF

74.5 KB Created: 2021-03-14 12:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b37bb74594b14eecbfc0a965f20b79d SHA-1: b4c2d23934510045235e8d6201ffee63c95db415 SHA-256: 34a65b1934063fc0034b1be55166a869ae32e393a583c834f606da789fab2a2b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The document body, though truncated, suggests a lure related to GRE test preparation, which is a common tactic for phishing or malware distribution. The presence of ClamAV and ML heuristics flagging it as malicious further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=what+is+the+best+gre+test+prep+book PDF link annotation
    • http://instapriz.site/navokogubajofakixu1124a.pdfIn PDF document text
    • https://powofowus.weebly.com/uploads/1/3/4/5/134583567/timoruvejuzojib_silavepag_jovezamububaki.pdfIn PDF document text
    • http://dontbeshy.xyz/free_among_us_skins_and_pets_mobileqgxkc.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/25770d2d6c0a850.pdfIn PDF document text
    • http://fomamiforepu.22web.org/sibegidefavovasomixin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizodufuxot.rf.gd/zinuxuvonivujetojemezuta.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/paduloluvixitadadumedug.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_ee45f9847fd14676937cc45bc56f592a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/xotaju.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/67528610499.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/33808384555.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_c173ed6b70ec4202b6a84dc5acdc7614.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_3c79891fad5648bea61dacd93a865656.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/corioliskraft_formel_erklrung.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/8273279379.pdfIn PDF document text
    • http://fokemadet.epizy.com/78197798386.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 5268 bytes
SHA-256: efa793f1f6324c92b42df692ca3761806743f27137a7c1cebc188fcd6fac9873
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 11288 bytes
SHA-256: 832e04ab7b03858b2702fb417f9589a4d149fd40be6bd359a9b5d93808820691

Open this report in the interactive analyzer, or submit your own file for analysis.