Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6f1e64aa7f9487…

MALICIOUS

PDF

94.7 KB Created: 2021-03-18 22:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 49451bc6a217e90a8302e6b89b8f80c9 SHA-1: 4690c2a092cb590044fb71be2b545a0e770a1a28 SHA-256: 1a6f1e64aa7f9487bf6797d28f236105728932e86075ec41c3c1b24b2bdf3248
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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://soxebez.ru/123?utm_term=aspergillosis+broncopulmonar+alergica+pdf PDF link annotation
    • https://cdn.sqhk.co/wabajevebe/eshhtKq/famudikave.pdfIn PDF document text
    • http://christmas-gift.ru/is_there_a_sequel_to_blood_on_the_riveryb92b.pdfIn PDF document text
    • http://yblda.fun/tuzavelowofisiker200dr.pdfIn PDF document text
    • http://wegansit.space/xusitejeji9msl0.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/hbwJe6M/194844248.pdfIn PDF document text
    • https://cdn.sqhk.co/xapawavuma/eOYjezf/hero_jump_game_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/girRia2/29295010957.pdfIn PDF document text
    • http://zumbayuliya.online/mantis_tiller_parts_breakdown8uuw3.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/ijgg3AZ/chakravarthy_movie_full_hd.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/59165739682.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/amiodarona_dosis_de_impregnacion.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/idieq8J/target_shooting_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/hjygdia/87046341006.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/29130401550.pdfIn PDF document text
    • http://leniwatojetojem.medianewsonline.com/wujavuzaz.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/yihgghJ/child_care_near_me_open_early.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/ludipenazibotaxikiwavot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_f4fc783d5794452f8b73c64a80138c42.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_9cb8efbda0f74cb98dec260ce897e23f.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_6de4e7e3ee2e415396857070820a84a5.pdf?index=trueIn PDF document text
    • http://xufoziminep.onlinewebshop.net/29950934291.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/wudizute.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://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 5604 bytes
SHA-256: 0f71d0a7cc29fc620c08f238b6e9aa2243b6fc988be5f31ff7c40d42c6d77a8d
font_01_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 20968 bytes
SHA-256: 25d2fbfb5dd46bce752f1a10cbb8fe29a5ece10bd9e4a33cfa5ea6c363d8700b
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 2276 bytes
SHA-256: fc56fa02dbe3458291c5fb7062dec2b01f2226dd21b4eff9ce88880a69c4a691
font_03_sfnt_off00013bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC5 11120 bytes
SHA-256: 7819245da5d81726acc6f648826c53706a64da1f0e763eed16a299df98fd489e
font_04_sfnt_off00016191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16191 2056 bytes
SHA-256: 589f2a64e89766a8ae62896ea8444fa1a87810255c984bbc4fd2a260c4929d56

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