Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1549c744c57c2…

MALICIOUS

PDF

73.0 KB Created: 2021-03-22 18:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15f0dc0880eb215cc53b469924bc6e39 SHA-1: 82cba03915a41ff1eb8428526cf6af9bd22d7736 SHA-256: 42c1549c744c57c292d2300fc748ee554b78d5e7204d9dfdc55d39b567977392
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'seumenha.ru' and another heuristic indicating a link farm with 30 external PDF links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=congruence+and+rigid+motion+worksheet+answer+key
    • http://wapividazofar.scienceontheweb.net/kijowadazegidobizopuvu.pdf
    • http://mitutepoka.medianewsonline.com/can_you_buy_a_pitney_bowes_postage_meter.pdf
    • http://vizilirudigub.getenjoyment.net/math_worksheets_for_1st_graders.pdf
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/roruf.pdf
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/lakokixiwezuj_sewava_fuvewekuzumu_katalori.pdf
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/982855b6ea8.pdf
    • http://sinoxaju.mygamesonline.org/world_map_quiz_game_jetpunk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zulezov/jumopizagugokasozefo.pdf
    • https://s3.amazonaws.com/taguxif/ruwol.pdf
    • https://s3.amazonaws.com/nelizenejakarug/shakespeare_the_tempest.pdf
    • https://s3.amazonaws.com/mesixadelomomo/24742668681.pdf
    • https://s3.amazonaws.com/wibedubosateg/57391845195.pdf
    • https://s3.amazonaws.com/resisuna/where_to_buy_digital_photo_frame_in_singapore.pdf
    • https://s3.amazonaws.com/tojazudibumogab/amazon_prime_video_apk_xiaomi_mi_box.pdf
    • https://s3.amazonaws.com/begijufadi/contest_winner_letter_template.pdf
    • https://s3.amazonaws.com/pegebunov/jiliv.pdf
    • https://s3.amazonaws.com/forupokisip/masked_singer_australia_wolf_performance.pdf
    • https://s3.amazonaws.com/biwubeleba/how_to_fill_surrender_indian_passport_form.pdf
    • https://s3.amazonaws.com/gotenukevepunin/atlantica_online_gold_making_guide.pdf
    • https://s3.amazonaws.com/gogoxowiniza/alberta_election_2019_party_platforms.pdf
    • https://s3.amazonaws.com/degagaziv/face_blemishes_removal_apk.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_off0000de3a.bin
1d06f06c68e459bbf1713190aad68b352bd4590c6b313fa10d3efdda5f711af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 5484 bytes
font_01_sfnt_off0000f0cd.bin
05106a587c0930401ed8fb4364999b00d296623b27452a413b895d83e9312e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10428 bytes

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