Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd37e14f5888474…

MALICIOUS

PDF

78.2 KB Created: 2021-05-25 09:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fa4b5bd31c2b2b8708a9fa382a898869 SHA-1: e77ca7ca7247b1e70e1275b7d7025b2ddd8eab1e SHA-256: ddd37e14f58884740e3dd23d8446892792b3c03cc66f4cfd08986ff74158dca8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=precalculus+mathematics+for+calculus+seventh+edition+by+james+stewart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452853/normal_5fd7d98403484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_6008fbc5b178a.pdfIn PDF document text
    • https://pokekuxabinupar.weebly.com/uploads/1/3/4/0/134016783/pefuxowivoxonufeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_604e5b2354512.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/bb5b049da.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/9c197646f.pdfIn PDF document text
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/zunoreraki_ximirus_mobepis.pdfIn PDF document text
    • https://liburesaxus.weebly.com/uploads/1/3/4/3/134372769/webodoserijafune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6059afca2f41f.pdfIn PDF document text
    • https://duxevuwelinabim.weebly.com/uploads/1/3/4/3/134353564/3770626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe2bc0dce682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_605d95e71448b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc91028e5e64.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/d7993dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_6029a80bd92dd.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/29b1a44a.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/bipovoromoj/498688928.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/89211117837.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/61355940301.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/california_king_sheet_sets_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/kitezizijokivuvomip.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/gobawolaxaxa.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/f_scott_fitzgerald_the_beautiful_and_damned_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/bylaws_template_for_s_corporation.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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5732 bytes
SHA-256: e58a242d447c0c85260ae9963b48d9713b058ef2c62d66f82f8023e6ea9fae08
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 11448 bytes
SHA-256: abf2c480c9947c3baeabda28d03d40084ded2f02e557b50f51d8a8974ce97de1

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