Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dea63ae2ff9a830…

MALICIOUS

PDF

91.6 KB Created: 2021-04-05 23:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e79a8785a601d8c565ee3c68c61ff804 SHA-1: b945ddd802be7e30ad4238c7a9ef1c9c83b3d439 SHA-256: 4dea63ae2ff9a83082402f3614d3d87ca0ca035f43b548d5a331b51ba89f4820
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a significant number of external URLs pointing to various domains, some of which are disposable or associated with potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests an attempt to lure users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/123?utm_term=diazonium+salt+formation PDF link annotation
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/wutasolijizimok_xolesunewamu_kixisodaj_valituze.pdfIn PDF document text
    • http://pornbustyvids.com/kidizujefeturol3pp8.pdfIn PDF document text
    • https://gipazekafasulal.weebly.com/uploads/1/3/4/6/134600210/tulinokugonuziw-dibakekilere-sufufuxemugerad-segojomeb.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/phaie9y/3424345097.pdfIn PDF document text
    • http://snapchat-alert.com/damibumugefogukdc2.pdfIn PDF document text
    • http://lnstagrambusiness.com/dipawikibimijijivezuzwhpiy.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/Igdh7M9/yellowpay_agen_pulsa_topup_game_kuota_termuraha.pdfIn PDF document text
    • http://constructionhouse.info/zusalipojuxusijisekaxq2r.pdfIn PDF document text
    • https://rogusavonovupe.weebly.com/uploads/1/3/3/9/133997589/a86ed49cccfa1.pdfIn PDF document text
    • http://girlita.space/61959795614q1vp1.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/heTjhjj/daluluripigebakito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_5f20ab56f7a3411d8bbd24344ba8cb74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekezaru/47169951940.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_8a855ac6b782448eb7c2cb7688f268cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/20994833363.pdfIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_e5459cad633f4375bf6fa7221f03cd3f.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_983d41b3da2d40f19ac34824e5b26f58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/how_to_make_an_egyptian_pyramid_with_cardboard.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_dce8479c158f455e89b8e905fb0f7c1f.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 4724 bytes
SHA-256: ac07e0d7dc08cebec4d25c5ce44ddd183f045883376e3f0e065207b7c44b0cd7
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 12280 bytes
SHA-256: 3704c1a4443809c4e5b1ca8a7d464ff0414d22b6b634566e8c9941fcf6e8728e
font_02_sfnt_off00013c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5A 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off000150f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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