Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff43ce89260e6ce…

MALICIOUS

PDF

84.4 KB Created: 2021-03-21 05:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a879f14456c2f3c7127171dd8e961ddd SHA-1: bb0017a8b20e2b9ae21cf142d2465acc7ac7a753 SHA-256: eff43ce89260e6ce1a4bfddfde283c20445b56cfe71bcdb285f5c56958dfe0ca
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to direct users to potentially harmful content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://leonvi.ru/award?keyword=advanced+energy+materials+pdf PDF link annotation
    • http://outputqwvk.space/compound_sentence_lesson_1b_answers07ys2.pdfIn PDF document text
    • http://remont-kholodilnikov.website/bewars_movie_song_in_telugui1jsk.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/vuwuz-danisa-rilolof-gekuzagosinuw.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/61601112467.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/fb65d1b.pdfIn PDF document text
    • http://instapresent.site/nirurovewawugimwhi2i.pdfIn PDF document text
    • https://pesudimudoselu.weebly.com/uploads/1/3/2/6/132681392/zevolenupena.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/precalculus_student_edition_advanced_math_concepts.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/4184932.pdfIn PDF document text
    • http://jakor.pro/mewivumiburuvotosoboxt36vh.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/sepubolef_budilijibol_lekiliradutak.pdfIn PDF document text
    • https://fagowegegex.weebly.com/uploads/1/3/5/3/135315381/40abea004b6.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/varuduwoledekanan.pdfIn PDF document text
    • http://wildboost.club/kiwesowejafapufozubo4ou60.pdfIn PDF document text
    • https://fusasevamasaxig.weebly.com/uploads/1/3/4/8/134866100/2259470.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/5339019.pdfIn PDF document text
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/755c045e72c754b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepolujogox.atwebpages.com/41636722132.pdfIn PDF document text
    • http://wugupijejituzog.rf.gd/bayesian_methods_for_hackers_probabilistic_programming.pdfIn PDF document text
    • http://vuwepimu.epizy.com/67944274749.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/skinnytaste_meal_prep_cookbook_index.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/sewage_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/88971733695.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/103880206.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/newer_antimalarial_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/urdu_pronunciation_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/pajama_friends_ep_10_eng_sub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 5628 bytes
SHA-256: 8aad69a464a029ce4122298d6baa00e98987c9e0268d372faca772e345f3cea3
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 11184 bytes
SHA-256: e5f6d1f26a326c578f62a84db0ca5fb611045c771245f7ec93fea3b4ba451f58
font_02_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90