Malicious PDF — malware analysis report

Static analysis result for SHA-256 873163751e688c35…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 16:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04e0d0bbc8201fbdf459732c22291a16 SHA-1: 1a1c58d40b447c3c2251ba9054ae06c2f77f3fd4 SHA-256: 873163751e688c3543d17b2510d3665dbf6bcc4f336f911c281e8dcd66bf5b5a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or redirection strategy. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards a malicious intent to redirect users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/aws?utm_term=you+are+so+beautiful+to+me+piano+sheet+music
    • https://cdn.sqhk.co/manuguwe/ifFjatC/mobile_icon_png_blue.pdf
    • https://sizigemud.weebly.com/uploads/1/3/4/6/134606095/vuwumazoxeman-ragepipoxonapom-wejuga-vovubegodexove.pdf
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/levimapar_nelujowipuj_desuji.pdf
    • https://cdn.sqhk.co/lazuxorus/BHNijth/43608539807.pdf
    • https://cdn.sqhk.co/sabepakofo/jemPBii/neon_city_riders_review.pdf
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/382504.pdf
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/geviragag.pdf
    • https://bugajexovul.weebly.com/uploads/1/3/3/9/133997498/4f2b5.pdf
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/polepudufuwoxutil.pdf
    • https://cdn.sqhk.co/bijukipuj/jeolUgu/fiji_airways_business_class_sfo_to_nadi.pdf
    • https://static.s123-cdn-static.com/uploads/4481520/normal_5fe462dbe02d7.pdf
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/a0bbac490970bb.pdf
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/8e1f3.pdf
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5fe4ac9e3cd3f.pdf
    • https://cdn.sqhk.co/nubavojek/BjiRkcs/fijajugitog.pdf
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/46f5184fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/potofaw/33787825084.pdf
    • https://s3.amazonaws.com/sixenogafopoj/18947229752.pdf
    • https://s3.amazonaws.com/sisaxu/scholarship_donation_request_letter_template.pdf
    • https://s3.amazonaws.com/wazagidonux/what_are_the_signs_a_married_man_is_interested_in_you.pdf
    • https://s3.amazonaws.com/rupatojuko/online_indian_wedding_card_maker_free.pdf
    • https://s3.amazonaws.com/fuvidokibet/artemis_fowl_the_lost_colony_audiobook_free_download.pdf
    • https://s3.amazonaws.com/pokorevalaxex/zesetasoboguvavaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7d.bin
440ef42651a0f2028587e74072885fac73b64bc783f0b4f4bf8e1f564dea1b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 5356 bytes
font_01_sfnt_off0000fd86.bin
5905702e9825e7576e8c257de3b19da00255d2def6b9f5ed232054868cc5f9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 10704 bytes

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