Malicious PDF — malware analysis report

Static analysis result for SHA-256 9505bf828a686206…

MALICIOUS

PDF

79.0 KB Created: 2021-03-25 18:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb74d524494b1165896cd186720f1aee SHA-1: 218063f5fd414337db867534dad833e8e66b18fd SHA-256: 9505bf828a686206f7b7d4453b1a9184287463630b1a330b75ffcb1071dfa77a
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results for a book. The primary malicious URL, https://nipisod.ru/award?keyword=the+african+queen+c+s+forester+pdf, is flagged as a redirector for free-download phishing. ClamAV and ML classifiers also identified the file as malicious, specifically a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=the+african+queen+c+s+forester+pdf PDF link annotation
    • https://cdn.sqhk.co/kiribikiv/gc6hbPb/livovowisu.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/iicghWO/lezuganejeraweru.pdfIn PDF document text
    • http://choosemadam.site/lidamupitokeduslbfpg.pdfIn PDF document text
    • http://reactivaperu-2020.com/71897323996gwvru.pdfIn PDF document text
    • https://cdn.sqhk.co/boremagu/huhYjFJ/android_music_player_project.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69b12d55-863e-458e-a545-ad358ed6bd1a.filesusr.com/ugd/a9642c_03de0a361cd946f3b1313df69ac74448.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_a02ff6c7f440400fa68a0e200a58fd5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/nowanovawemavule.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/indian_army_warrior_song_video.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_805ddf76b0094fe9a4337595ef965902.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voropa/80758379082.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_98899503cc054fd986ed18cc99f7ab62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/romeo_and_juliet_1968_age_of_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/jejaduwevikodusakitax.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_71d4080b668b4999a193cd9ebbf4283c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/canadian_citizenship_test_practice_quiz_questions_answers.pdfIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_7044707f9e2e4d6ab25b575bc26bad55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/bike_racing_game_hack_mod_apk.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_092acefe20b54813a922552bf6729e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/answered_prayers_mtg_playmat.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/79844524068.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5284 bytes
SHA-256: 81c2867f3cda7be30424ae5fc0a5d09d38d964c52da975c5a576d41974900822
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 11592 bytes
SHA-256: 978a8865e3acc42543e0ca72d2f12295514786e6441a775078811cad5dbfa44b