Malicious PDF — malware analysis report

Static analysis result for SHA-256 138f27d061f85131…

MALICIOUS

PDF

74.1 KB Created: 2021-03-18 11:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eac8215bfaba7bc4273a42417e35b45 SHA-1: d00d3035041ae2baab5e4e4262eb4aa7f56b529c SHA-256: 138f27d061f85131bb4aa9c450d7e5c8a94cb8352392e9e9a23b84862b1a75ca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO poisoning tactic. The document body, though heavily corrupted, contains text fragments that hint at a search query response, likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=response.+contenttype+application+vnd.+ms+excel+pdf
    • http://kojewotezigu.iblogger.org/17649520572.pdf
    • http://rawajajeko.iblogger.org/ibps_bank_po_syllabus_2020.pdf
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/4d9fce.pdf
    • https://cdn-cms.f-static.net/uploads/4460682/normal_605281961e9d9.pdf
    • https://sefidobove.weebly.com/uploads/1/3/4/3/134320077/b1e65dd5e9695c.pdf
    • https://cdn-cms.f-static.net/uploads/4476126/normal_603e81d4b0698.pdf
    • https://static.s123-cdn-static.com/uploads/4377717/normal_5ff0026f3560f.pdf
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6017a29834ec1.pdf
    • http://bawikivogo.22web.org/barbara_cartland_novel.pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_60397639777c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/novipaliwid/xoreposowato.pdf
    • http://tunowik.epizy.com/91780023112.pdf
    • https://s3.amazonaws.com/kavalukato/1516559281.pdf
    • https://s3.amazonaws.com/xamibudasagas/calculus_swokowski_free.pdf
    • https://s3.amazonaws.com/venunamazozuzo/sites_to_movies_and_series.pdf
    • https://s3.amazonaws.com/tudawufed/ssc_10th_class_biology_textbook.pdf
    • https://s3.amazonaws.com/kofabube/gujedozimajigezevasi.pdf
    • https://s3.amazonaws.com/vufuzewasi/background_music_for_slideshow_free.pdf
    • 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_off0000df94.bin
fda5066d453b65da52deda5c7b32591afabe40a80019bd172d0ad79b671aba57
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 5476 bytes
font_01_sfnt_off0000f24d.bin
2a3ca5d93faa858402f8d33383d35c04c423508204838b825b5e113517d35de4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 11468 bytes