Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fedb079d511b63…

MALICIOUS

PDF

82.9 KB Created: 2021-03-23 03:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f7d7d1b9d89f1f4cd6ac73add5335db SHA-1: 537fdbccbbc7589f49a32f354d04702a8d03b6f5 SHA-256: 51fedb079d511b63162ec092f831a473f2a76e77ddfba66bb388c03412a0e0ce
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, specifically as a phishing trojan. It contains a large number of external links, indicating a potential link farm or a mechanism to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to exploit users through deceptive links, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=ankle+injury+icd+9
    • http://noksipals.online/354590972893f49m.pdf
    • http://lnstagramcopyrightcenter.com/44870957420sxdux.pdf
    • http://thrivewebs.com/the_sedona_method_audiobookbcgfo.pdf
    • https://cdn.sqhk.co/dutebevon/gdhExjd/42866372050.pdf
    • https://fafemuwupid.weebly.com/uploads/1/3/4/3/134368635/7238477.pdf
    • http://rexonina.medianewsonline.com/98876097180.pdf
    • http://jikusofare.mywebcommunity.org/the_art_of_talking_to_anyone_book_in_hindi.pdf
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/c4b0b9.pdf
    • http://xijivedijimidip.mygamesonline.org/xarip.pdf
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/kenubopurono.pdf
    • http://juvizex.sportsontheweb.net/pugejafetifafepevugebuzov.pdf
    • http://skidki-day.store/liber_null_peter_carrolle4wg6.pdf
    • http://adanakebap.org/puvaginogukozujupupozr2yfe.pdf
    • https://cdn.sqhk.co/wazafanez/1y3S0W3/85443063677.pdf
    • http://lollipopa.online/7835792180gehch.pdf
    • http://richteam.site/jatumaperonesnps6w.pdf
    • http://eyebrowthreadingdallastx.com/troll_mount_vendor_bfabm9d9.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/sexeda_sodesoxa_lowadur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_3903f4e0a13d4cdc927a48519a180ab3.pdf?index=true
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_abdb797790f14b6b9f3546baabe56ddb.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_c51e7a4a067942f985a35e8997215d8b.pdf?index=true
    • 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_off000109d7.bin
cf16aa5dbe66d0f4f40a6ad5e4d16779a6b41b0a4659251c47596dea09889732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 4932 bytes
font_01_sfnt_off00011ac3.bin
3f672d125fe35dd126aeec3e68d11f90a6da15dd68f5a315a8c7c461cad0baf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 10900 bytes

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