Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e4103a5e50ed73…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 03:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d3bb7e72ffebff1ccd3ee51113ee3ef7 SHA-1: 10dc602ef66f297306497e4a05f7328ae38243e9 SHA-256: 55e4103a5e50ed73c98b9f3efa59b2f2f31c5ff425b3be4065650b6a30fde813
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDF files. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://golowaki.ru/award?keyword=atonia+uterina+factores+de+riesgo+pdf PDF link annotation
    • http://xigakusaruwu.iblogger.org/zisesipeduzoluxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff544d1032e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501509/normal_6058821ff2244.pdfIn PDF document text
    • http://cetop.xyz/warm_bodies_cast_rnofxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_6049ada1b4963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_600efce0ad583.pdfIn PDF document text
    • http://ritual-venki.online/85009396438gngh.pdfIn PDF document text
    • http://familyit.pro/9888047061r32vp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_604b7b208ca28.pdfIn PDF document text
    • http://dusinetukuzif.22web.org/resumen_del_manifiesto_comunista_capitulo_1_y_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tapexiw/mopij.pdfIn PDF document text
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_b9df3fc9346843d990b9cb1d6253f6ff.pdf?index=trueIn PDF document text
    • http://vebavibokifoko.epizy.com/10178205850.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/accordion_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/subject_verb_agreement_exercises_advanced_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/choices_apk_ios.pdfIn PDF document text
    • http://medevigad.epizy.com/wiwapelupurorasizab.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/runescape_dwarf_cannon_range_training_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/89337600973.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_e9bced0f7a1d4c5c89e33ddccd531a58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/car_racing_games_apk.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/5259525210.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_5041e05f8a15404b99aca25ac4efe9c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/best_android_music_player_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/labazadawagivinunu.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_07f36c0a75ad42b88f400d37d8836a9d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 5280 bytes
SHA-256: fbc35f0c2b295745fc5e9131c0eb6a556bdb40fe5eb3aa70f95212fbe1271551
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 11732 bytes
SHA-256: 739891209af7e155f2fc80fc4fdc77379e66702c1a954cc7d9058cfd6190630b

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