Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3db3dcfaab93a1…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 21:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e4b8e22ecd8c6fc1b500bc82729181d8 SHA-1: 4bc2dbbf91762107bd73fa77dace6e63b24680a5 SHA-256: 7f3db3dcfaab93a19b2c50ef4724f0448fe6cc490acc73d083fd4e321ebd64d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to movie downloads, suggesting a lure to trick users into visiting these malicious sites. The presence of external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful content.

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://bologen.ru/123?utm_term=the+adjustment+bureau+full+movie++mp4 PDF link annotation
    • http://soluzixod.66ghz.com/occupation_definition.pdfIn PDF document text
    • http://bojikewexojok.iblogger.org/rovutup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_5fd9a1c12c257.pdfIn PDF document text
    • http://finansi-7.online/literilofamo5nogk.pdfIn PDF document text
    • http://bilet-pdd.site/pakofawufisaxavegu250bl.pdfIn PDF document text
    • http://damita.fun/fikumulazevenipusunimuzimgohe0.pdfIn PDF document text
    • http://dream-stat.ru/aruba_105_firmwarejl3va.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5feeb98281e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_6042f8addbb21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gusalixofunek.epizy.com/42135513035.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_06a98460e0814516b6767f32d83d189d.pdf?index=trueIn PDF document text
    • http://tadudaxejede.epizy.com/baghban_film_song_ringtone.pdfIn PDF document text
    • http://dixurudij.rf.gd/cartoon_wild_animals_images_free.pdfIn PDF document text
    • http://soromivimurug.epizy.com/konuzerosabavapejajasowe.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/nobosapagu.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/97220028182.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/vopumuma.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/18764648575.pdfIn PDF document text
    • http://sijaxulo.rf.gd/self_guided_walking_tours_of_dublin_ireland.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_04cf3f236dbb4d26a53958bacb8b1b15.pdf?index=trueIn 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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5592 bytes
SHA-256: b30b72eb4f926fcb60b5a7a602e366e6bd5185b20f3a744c2d7ab4d2df109c9b
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 13136 bytes
SHA-256: a242ec0b22a4a6e1d3ef7eeab9948ea1375423cbc60669535e3865da23fab5e6

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