Malicious PDF — malware analysis report

Static analysis result for SHA-256 337a79e1ebdb7e9a…

MALICIOUS

PDF

65.0 KB Created: 2021-01-19 14:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5249d371be09e4c1c99ee226cfec5dc7 SHA-1: ac784e7ca7e68facf377915a786c9ff189d51ad5 SHA-256: 337a79e1ebdb7e9ad65f167893d8f56dc56e460914a7de01496b6e92476d742d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and disguised as an 'Ecri institute login'. The presence of multiple disposable hosting links suggests an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest a phishing attack vector.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=ecri+institute+login PDF link annotation
    • https://site-1168324.mozfiles.com/files/1168324/accidents_reported_today_minneapolis.pdfIn PDF document text
    • https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/forirexozodejolu.pdfIn PDF document text
    • https://kebokezuzak.weebly.com/uploads/1/3/5/3/135318209/siragesuwal.pdfIn PDF document text
    • https://site-1172346.mozfiles.com/files/1172346/rorutexitetimaru.pdfIn PDF document text
    • https://site-1175017.mozfiles.com/files/1175017/gobikekex.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/vetuxaxij_nonasanavum_saxixebapowen.pdfIn PDF document text
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/839972.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/physical_science_conversion_factors_worksheet_1b_answers.pdfIn PDF document text
    • https://site-1178037.mozfiles.com/files/1178037/scary_halloween_costumes_for_kids-_girls_diy.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/fipijife/92206120802.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/kshatriya_movie_song.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/nova_cracking_the_code_of_life_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/antiplatelet_therapy_guidelines_stroke.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 4712 bytes
SHA-256: c93d7f4e0ccfd2f8e64bb375520530b4982bf9c678ac746e10aa7e4f6031c79b
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 9884 bytes
SHA-256: 88e4bde90eb1891b8db43f30b74290d617621e1424d4a1265d32b9f90016776e

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