Malicious PDF — malware analysis report

Static analysis result for SHA-256 880c1571e005e8b1…

MALICIOUS

PDF

77.8 KB Created: 2021-01-02 13:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f90d9b1ce2ad4f147382a73fb5ffb633 SHA-1: e973c059d0180c0c22fd5f154f91037fa223f9a4 SHA-256: 880c1571e005e8b14db96605964a2534d4a23c5026609c8d1e598f174156cd7b
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one to 'traffking.ru', suggests a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users or host malicious content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/aws?utm_term=zoosk+premium+mod+apk PDF link annotation
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/c2422d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5f8e9e967c963.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/6d24eea4.pdfIn PDF document text
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/vexebedulotixi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovitiku/victim_of_love_lyrics_eagles.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/6408716926.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/surjit_bhullar_song_safari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdb8b2f-f346-414b-8519-0551111d939c/ou_football_schedule_2020_televised.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/93877993519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf15d587-0ca8-4c4a-931f-a15fc434a1a5/northstar_3_reading_and_writing_third_edition_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/stone_exterior_dutch_colonial_homes_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b29e63d-50c7-4e79-80b0-18313dcf66d5/8096855679.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 5092 bytes
SHA-256: 2ec4886da3aa1eb942bec4097da6369b78e75798560cd343977692c21345685f
font_01_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 12224 bytes
SHA-256: d5c26d79dbe3b2d2d027bf92fb95c1115c22cd0f57c7519b31f3a37aa578cff3
font_02_sfnt_off00011549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11549 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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