Malicious PDF — malware analysis report

Static analysis result for SHA-256 637439556dd429cf…

MALICIOUS

PDF

98.0 KB Created: 2021-04-16 17:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3426baec0c94543b4ebae237faf340db SHA-1: 575d6c237cea9015d8b439cbcbf84d440e5af809 SHA-256: 637439556dd429cffb99cf8c2d72547d7759d8871f6360874eb79224edbd485a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or a mechanism to distribute further malicious content. The document body, though corrupted, hints at a lure related to a "power cooker owner's manual", likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=power+cooker+owner%2527s+manual PDF link annotation
    • https://cdn.sqhk.co/dipasupor/4jahhz4/cheat_code_for_ball_blast_game.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleser/lsig2hd/tidakuwawuxukuki.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/igPvete/best_free_stock_trading_simulator_app.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/dqjaoeA/werewolf_online_para_pc.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/88639821467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fceccdec07b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5ff756243953d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ff2f9fd1850f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirulibas.onlinewebshop.net/73137187847.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/netirolefusilefe.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/hclnaoh_redox_or_nonredox.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/the_odd_couple_2_full_movie_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/54559419400.pdfIn PDF document text
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_1ed04e06a1c04fe59fa2da12bf2c6fe9.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_994be1bfc0544cc8a90b41fbf7f1ff92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/honda_rebel_500_for_sale_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/97247086226.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/history_of_english_literature_by_mundra_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/how_to_read_a_20_scale_ruler.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_570c77773a3248f583e01064b476d98a.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_off00014074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14074 5136 bytes
SHA-256: 0f4aba70539c021a6557fc97d14384c032e20586e2b46fc5a216cf9f87dc2fe8
font_01_sfnt_off000151f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F4 11892 bytes
SHA-256: 78807478ba24156ba568ea8155c439c7eedb8b54b081cb55c2b069b3dcecae54

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