Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f587042293a138…

MALICIOUS

PDF

81.8 KB Created: 2021-04-07 20:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 99a75a3ab315a430c3d42eb096b38eb0 SHA-1: ff6da3ef39c8aa4d39f9e2f6e137eea86b2de1fb SHA-256: 92f587042293a13880089388d46f310600c245c397f689f6f41789cdbc641cdc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to suspicious or disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, with a high probability of being a phishing or trojan distribution vector. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to lure users to malicious content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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://nipisod.ru/wix?keyword=tiger+camouflage+facts PDF link annotation
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/0ef983fc54e4.pdfIn PDF document text
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/ce4f2ebcf4.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/7949280.pdfIn PDF document text
    • https://kinajerabisar.weebly.com/uploads/1/3/4/7/134748515/603eed60c8d.pdfIn PDF document text
    • http://vedibekupuviru.iblogger.org/93114352382.pdfIn PDF document text
    • http://rugavup.iblogger.org/76443297905.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/903036c00c.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/pelaribusafumetajez.pdfIn PDF document text
    • https://linanilutujaro.weebly.com/uploads/1/3/1/4/131453593/5305849.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
    • https://uploads.strikinglycdn.com/files/867423f7-d8e6-4c89-a190-53cc8e7b264f/braun_thermoscan_6022_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c60c25d-0bd5-4e57-853e-30a2309b409a/rise_of_scourge.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/lure_fishing_for_wels_catfish.pdfIn PDF document text
    • http://dezologukow.rf.gd/asset_accounting_process_in_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/ra._one_chammak_challo_film_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802883fb-a667-4edf-8b7e-85a582a5cce1/the_masque_of_the_red_death_setting_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8e7759-e10f-4735-9ff3-ec2201a5113b/berogoxejejabef.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_2df867469dca431b8eae403227095f02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/forager_puzzle_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a218bea5-c874-4f76-aefe-81c61a08a761/why_is_my_printer_not_printing_the_right_colors.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/download_playboi_carti_new_songs_mp3.pdfIn PDF document text
    • http://jalaverej.epizy.com/burra_katha_movie_songs_free.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_e713adf5e7654e299cfa82e1389a9be4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 4928 bytes
SHA-256: 56267a3225261c8fd0339cd04342badea1294435fa313d7ac1a0ff284ce76a22
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 10344 bytes
SHA-256: 739b0490125f4f8e29aa26a5dc330068247a4527425b79c306f52abc900f874c
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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