Malicious PDF — malware analysis report

Static analysis result for SHA-256 288aed239fed04ee…

MALICIOUS

PDF

74.8 KB Created: 2021-04-24 15:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ee6071c501209507c7f882f7cb2bcee SHA-1: 800bd104e4926ef2a1e75a458599daea8411caec SHA-256: 288aed239fed04eefdd36d20046bd691fa3f1ead4aae5525d0a9e69a3c8c7f66
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, which is a common tactic for distributing malware or conducting phishing operations. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further stages of an attack.

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://lozipotod.ru/strik?utm_term=uniform+probability+density+function+excel
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/xevusuj_moxezijefot_waluzege_jajojufoto.pdf
    • https://cdn.sqhk.co/duputokodoz/hjhiig9/59004487053.pdf
    • http://zumbayuliya.online/jezaronaboti0i3zo.pdf
    • https://cdn.sqhk.co/xivovido/Lhjhcja/mobile_legends_adventure_codes_list.pdf
    • https://cdn.sqhk.co/kikolibub/c1ifghv/lexetonudasusaxemaregar.pdf
    • http://lefuvaguvupawax.iblogger.org/consort_diagram_template_powerpoint.pdf
    • http://fukoxonezadanom.22web.org/24794458908.pdf
    • http://yandex-delivery.cc/58356011246fsabt.pdf
    • http://bathforlegs.xyz/lewifinujarazezezaferedafwe0f.pdf
    • https://gereveporona.weebly.com/uploads/1/3/0/7/130775593/e57d071e.pdf
    • https://cdn.sqhk.co/kifukuvitog/jidjahf/up_opening_scene_review.pdf
    • http://vejefulolite.22web.org/vofemujan.pdf
    • https://cdn.sqhk.co/sixepatexup/hal70gj/28679809940.pdf
    • https://bexaxaxaf.weebly.com/uploads/1/3/2/6/132682125/benawupuzo.pdf
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/5681673a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokit/danby_12000_btu_portable_air_conditioner_dpa120b6wdb-6.pdf
    • https://uploads.strikinglycdn.com/files/364c0c63-8611-41fa-995d-ac7deb3c3cda/old_school_runescape_trailblazer_league_hiscores.pdf
    • https://s3.amazonaws.com/zasepo/wokoxavenamanoxapodazevi.pdf
    • https://s3.amazonaws.com/davawina/posicion_antalgica.pdf
    • http://lojuwuwa.rf.gd/zuwewu.pdf
    • https://uploads.strikinglycdn.com/files/88524f81-3fb5-43ff-aec5-ba9401c38467/duwumuwuvasesakofijesuju.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_off0000e20d.bin
28c8c4e7deafbb7520fd253a37e445653dfc9e3529bdf23a6ead3cb05884ee40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 5604 bytes
font_01_sfnt_off0000f50a.bin
065e47b5ac97884c6f03b3130721b5873c56f4f6b38b04de1fd512e01f321730		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 11824 bytes

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