Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a25aca7b12d44e…

MALICIOUS

PDF

73.5 KB Created: 2021-06-04 03:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60bb30d78f2053c8af72a1ca14a4345d SHA-1: dc1c02ebb00849429a2b37645c741a902bf072a7 SHA-256: a6a25aca7b12d44e5740c0a96f6c99e67b83e7b2c2db9420d2d5564b65cb5510
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is 'https://catamma.ru/pbw?utm_term=call+of+duty+mobile+free+download+apk+for+android', which appears to be a lure for downloading an Android application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/pbw?utm_term=call+of+duty+mobile+free+download+apk+for+android
    • https://veburuja.weebly.com/uploads/1/3/0/7/130739173/583cf7e.pdf
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/zadagowonemaj.pdf
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/0ed20279.pdf
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/7086839.pdf
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/natuvene.pdf
    • https://wunepilupizuxo.weebly.com/uploads/1/3/1/8/131857535/dagirajitijatat_vubupukubomugo_wiser_xotomemogin.pdf
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/gawetif.pdf
    • https://sodamosubiduv.weebly.com/uploads/1/3/4/0/134012739/5908427.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8874d002-dc63-4618-934b-492fe3c87bde/77221942909.pdf
    • https://uploads.strikinglycdn.com/files/fcb8cd82-4e51-4d95-88e6-a3ef446760ed/brown_bear_brown_bear_what_do_you_see_writing_activities.pdf
    • https://uploads.strikinglycdn.com/files/157c0ecb-9935-4666-8870-4e47120b28e6/ap_music_theory_test_date_2020.pdf
    • https://uploads.strikinglycdn.com/files/3f6bf757-1ffe-408b-993b-810753b51b2c/onkyo_tx-nr636_arc_not_working.pdf
    • https://uploads.strikinglycdn.com/files/dbff882b-6752-4f6e-a6c3-395db8cb7f36/pokemon_platinum_walkthrough_eterna_city.pdf
    • https://uploads.strikinglycdn.com/files/9e470bfe-813c-45e0-b897-1edcf28155b8/what_happened_during_the_renaissance_period.pdf
    • https://uploads.strikinglycdn.com/files/d3ec0fed-57c0-4562-b93a-8ac8fe4e6394/which_linux_distro_is_best_for_gaming.pdf
    • https://uploads.strikinglycdn.com/files/0e4d3845-9c9e-4de6-a9a9-a0e568173bc3/watch_battle_royale_movie_online_free.pdf
    • https://uploads.strikinglycdn.com/files/d63ecc9c-75bc-4c90-9ba5-4b063c633575/11737177642.pdf
    • https://uploads.strikinglycdn.com/files/510f9bf6-92de-4e41-a4a7-dbeb985d88e2/power_electronics_inverter_manual.pdf
    • https://uploads.strikinglycdn.com/files/fb1d34cc-8398-4303-a428-456864d99de7/37434680832.pdf
    • https://uploads.strikinglycdn.com/files/9a7936fb-5f0c-4fda-986a-13e1bf016fe2/tufekusijexizuwaju.pdf
    • https://uploads.strikinglycdn.com/files/670e411b-b557-43fd-a1d0-4053ce6379c5/461456173.pdf
    • https://uploads.strikinglycdn.com/files/d00ca23d-dc7a-49c7-b9e5-fa24bb3726f0/john_deere_110_tlb_for_sale_ontario.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_off0000df45.bin
db870e93844abe5eb7df49da95a3c07a5ee980086242fc914587f675be7b6280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 5312 bytes
font_01_sfnt_off0000f157.bin
88345cbd9016870addc2efea5e206683260136ce979f5552bffe5007c73d1dec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 12688 bytes

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