Malicious PDF — malware analysis report

Static analysis result for SHA-256 521a3378d26bb9c1…

MALICIOUS

PDF

73.0 KB Created: 2021-02-15 13:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: af949ff6500c84caf16b47c0a0897199 SHA-1: 042a7d4767b374b6289aa1db417127430bb2d4fb SHA-256: 521a3378d26bb9c18c227f9a75bf769e7c90ac7336ec22cc655b61fb2b7d2e7a
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. The document's content, though obfuscated, appears to be a lure related to 'mtga draft guide m21'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/wix?keyword=mtga+draft+guide+m21 PDF link annotation
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/e341ceaa98.pdfIn PDF document text
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/kerad_jafanixunifi_noverutigosix_pivalulimumide.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/7001129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_600706541e6ed.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/nitisodonid-moximozit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_60206ffc9e7b7.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/kotabowaropafewegifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fd663f78eb15.pdfIn PDF document text
    • http://strita.space/bring_the_soul_movie_free8xsvw.pdfIn PDF document text
    • http://slampochka.ru/democracy_in_america_summary_by_chaptern9x5u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dukudolit.rf.gd/52950199477.pdfIn PDF document text
    • http://neveket.epizy.com/56092090126.pdfIn PDF document text
    • http://wosazegaguzi.rf.gd/battery_ignition_system.pdfIn PDF document text
    • http://dojopugoput.epizy.com/variations_guideline_2013_word.pdfIn PDF document text
    • http://duvipegi.epizy.com/aprender_a_leer_la_mano.pdfIn PDF document text
    • http://tuwesexo.epizy.com/mann_aamir_khan_movie.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_off0000d63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63D 4872 bytes
SHA-256: f85f7d40d5ee62970cb561d8d82c3f81e552508dc2e0df120b44d97497834c06
font_01_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 9968 bytes
SHA-256: e963c307cf2a4ea455f0e3a3fee149c99f4f87d090a952192bd484fc6cede122
font_02_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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