Malicious PDF — malware analysis report

Static analysis result for SHA-256 861c1e68fbe50901…

MALICIOUS

PDF

80.9 KB Created: 2021-01-21 17:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d115a303a090400d4cad62c8208ceddf SHA-1: 224b4dc3168b78cb4c7258f3a34856ca19d3ac9c SHA-256: 861c1e68fbe50901814bff5369a87c65f6e892cada13dd32e55f7eab7a65486f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, pointing to a potential link farm strategy. One of the embedded URLs, 'https://trafffi.ru/123?utm_term=noaa+weather+corry+pa', is suspicious and likely part of this scheme. No scripts were extracted, but the presence of numerous external links suggests a phishing or content redirection attack.

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://trafffi.ru/123?utm_term=noaa+weather+corry+pa PDF link annotation
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/fuxuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fd840825c594.pdfIn PDF document text
    • https://vadutivolojogo.weebly.com/uploads/1/3/0/8/130813650/0ce6fed1a5.pdfIn PDF document text
    • https://lufodeku.weebly.com/uploads/1/3/4/5/134586195/8432703.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/0ab581ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401559/normal_5fe24b717d841.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/8ce7b2a83d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f93a9f02a840.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/4c34385daa0d88.pdfIn PDF document text
    • https://site-1178227.mozfiles.com/files/1178227/top_20_topics_to_talk_about.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5ff8f47447acf.pdfIn PDF document text
    • https://site-1166601.mozfiles.com/files/1166601/wee_werewolf_toddler_costume.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/pokorevalaxex/56326612042.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/paper_bag_size_template.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/opposite_words_in_odia.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/foliv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 4972 bytes
SHA-256: e65afeffba077b8f59ad5625432d79f6ab701b1e009ac29788a9dd5a4e18169f
font_02_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 10676 bytes
SHA-256: 736288af56aa8b1ac5adc7d1270f7be69483070baa7102bbe60d3c5198f261b4

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