Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833393ed1004803…

MALICIOUS

PDF

74.0 KB Created: 2020-11-11 16:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d4099c067ab62a3d8c5bf6da329fceab SHA-1: bf34a8f688d4e9b816130139703854df721cbf40 SHA-256: a833393ed1004803d68181072add1f551359c936c423bf8e9cd6000f843a7ffc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffnew.ru/strik?utm_term=cisco+ios+cookbook+3rd+edition', is a primary indicator of malicious activity, likely serving as a redirect to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffnew.ru/strik?utm_term=cisco+ios+cookbook+3rd+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f9f83c39adf0.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/6946222.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/wotaduwuv.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/safonogotonasuximitudozev.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/lesiranuzatedupe.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/xifeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/bethlehem_girls_lacrosse.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/samsung_rf30hbedbsr_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/xarapukajevofopaxopor.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/61479370599.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/herrin_illinois_high_school_graduation.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/logitech_mx_sound.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000cf28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCF28 14764 bytes
SHA-256: e7c32c150ceb9de9fe06935f9fc2cc6851b187effc9698b50ae58da139d2a066
font_00_sfnt_off0000be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 4964 bytes
SHA-256: 44826cf4fecf1acaff852d4a5fe08bc9f196b5a1407103bc2fd72e0ce26f4a84
font_02_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10200 bytes
SHA-256: ba8f45fde3ebcad572c18254442221959d60ca7d8b5af3069e8fe90b09e3ad1b

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