Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28390248c634a6e…

MALICIOUS

PDF

128.4 KB Created: 2021-02-18 12:26:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 7afa23e6382afc1dfd7855004aaf65a5 SHA-1: aa05a3a398fce30dbb568a7720829dd702f19976 SHA-256: a28390248c634a6e341431a6cd8df457cd9a9a167cc0c2be6c1f0b96eab9a1c7
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 or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wix?keyword=my+hero+academia+episode+69+english+dub+funimation PDF link annotation
    • http://igme.site/asuran_film_theme_musickwhvl.pdfIn PDF document text
    • https://cdn.sqhk.co/dosapupa/3gfhecd/zifarawugalipu.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/ghjhjcd/flightaware_flight_tracker_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/DjiaVia/39390843770.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/9843684.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jiLhbvQ/ticket_to_ride_new_york_board_game_review.pdfIn PDF document text
    • http://kokilubowo.22web.org/personification_exercises_with_answers.pdfIn PDF document text
    • http://theporte.xyz/422589427172ubki.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/dfbf3de2f.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/56c347f428ff0.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/ejfggij/novubigigefexake.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/6f8b18.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/zarelusipofox/ruwowufetutuvi.pdfIn PDF document text
    • http://vaburerewixa.rf.gd/general_guidelines_for_effective_communication.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/gagudunuludemazuzeni.pdfIn PDF document text
    • http://zatojuwetowoj.rf.gd/deep_link_android_medium.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/solving_one_step_equations_worksheet_7th_grade.pdfIn PDF document text
    • http://doxanoz.rf.gd/automobile_parts_and_their_functions.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 31724 bytes
SHA-256: ffc8dda24d3b5fd660fa13ed58b79e53363c1215ce617514cf15a5b80711b623
font_01_sfnt_off00018e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E00 6124 bytes
SHA-256: 5dfc27e186e970a6535aa3cafbf299905dfe4ad2975f19cf114e356f2a9f4954
font_02_sfnt_off0001a2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2AB 4532 bytes
SHA-256: 8b1f233c6a7c4fd0d1569106921b58cd7bee76db873e76301dc43ffc09650955
font_03_sfnt_off0001af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3D 14404 bytes
SHA-256: 5744bae831f413598b414728547d975188c8f908a8f690dacc511e414faad01c
font_04_sfnt_off0001dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC69 16648 bytes
SHA-256: fc1f90996c236808bff0debd30edfc20d4ac6abda7e3291613cc197108871f11