Malicious PDF — malware analysis report

Static analysis result for SHA-256 3424a20172d265f0…

MALICIOUS

PDF

81.6 KB Created: 2021-03-23 02:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e4775619f2013b1a8944f8c7d813d73 SHA-1: 206d69469c2f22fe27480abda3478e14dcc09224 SHA-256: 3424a20172d265f0ea7e967a6a63713de5dc1058bb075c4948eedf362ac438b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and lead to other PDFs, suggesting a link farm or SEO poisoning attempt. One prominent URL, 'https://dafemum.ru/wix?keyword=super+smash+flash+2+beta+unblocked+at+school', is presented as a search result, likely to trick users into clicking. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=super+smash+flash+2+beta+unblocked+at+school
    • https://cdn.sqhk.co/divojimo/gcjjCMa/decoracion_halloween_para_salones.pdf
    • https://cdn.sqhk.co/gijosevozu/gkhjgfk/catfish_cooley_tampon.pdf
    • https://wemogutidagumov.weebly.com/uploads/1/3/4/6/134669151/miwawaweboxepuk.pdf
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/1267471.pdf
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/gusapevixafuligu.pdf
    • https://cdn.sqhk.co/mogizilo/gfipY0K/download_game_wind_rider_mod_apk.pdf
    • https://rabiwibunefa.weebly.com/uploads/1/3/4/7/134747284/lepuraninojo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fatikonavori/mass_effect_3_kaidan_gay_romance_guide.pdf
    • https://s3.amazonaws.com/nezanurugega/sky_sports_transfer_deadline_day_reporters.pdf
    • https://s3.amazonaws.com/regovadeje/the_secret_life_of_walter_mitty_soundtrack_song_list.pdf
    • https://s3.amazonaws.com/zinudipir/how_to_fix_jetted_tub.pdf
    • https://s3.amazonaws.com/gelawiweza/89982495039.pdf
    • https://s3.amazonaws.com/gixirojozogufux/clear_cache_of_android_app_programmatically.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/lajudet.pdf
    • https://s3.amazonaws.com/rovuweraja/78575381171.pdf
    • http://senotujupube.epizy.com/alelos_multiplos_exercicios.pdf
    • https://s3.amazonaws.com/wegemebufojafak/yakuza_kiwami_pocket_circuit_guide_champion_cup.pdf
    • https://s3.amazonaws.com/fajetufekejo/dark_netflix_english_audio_track.pdf
    • http://vebadivikini.rf.gd/physical_therapy_coloring_sheets.pdf
    • http://fotobonifugore.epizy.com/kazedajizavufilefenapemov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f167.bin
12ec9874b6f1c5cf347b2ad339609f3c69ca7197eaef7c44c736be3c9bf72d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5668 bytes
font_01_sfnt_off00010483.bin
f3017d1f7d451b6501f8555c610d1138c2e15287911fbf3fd23f14b1acc81f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 11528 bytes
font_02_sfnt_off00012b18.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 4324 bytes

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