Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a99ec942d296ab…

MALICIOUS

PDF

80.8 KB Created: 2021-03-20 22:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 573967f7ee32547c20b6a58695e21edb SHA-1: 8620699d0f316c1be0597547e83332d4066bcf48 SHA-256: a2a99ec942d296ab3a4a3ba32d497ad7e587d659232ffd895779908653dc52c6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/aws'. The document body, though heavily obfuscated, contains text related to 'unlock combat knife cod ww2', suggesting a lure. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/aws?utm_term=how+to+unlock+combat+knife+cod+ww2 In PDF document text
    • https://cdn.sqhk.co/figegixo/hbhdPhj/36969662054.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/i1jehfV/migiwuzujoliwuwebive.pdfIn PDF document text
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/3455440.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/67472031928.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/xoluvonesa_vulekefatasexi_tenipuni.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/8309494.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/how_much_cost_to_check_dna.pdfIn PDF document text
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/884855dad.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/pisedij/zulusubevitezujenatotix.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/free_online_boggle_game_no.pdfIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/dideximesatiti.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_44c91b40159943be89a3502cccbd9090.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/merebusosos.pdfIn PDF document text
    • http://bugenuvumap.atwebpages.com/accrual_and_prepayment.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/reasoning_questions_and_answers_free_download.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_d69729962f5f4feba25568aadcd4bb03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/wendys_parmesan_caesar_chicken_salad_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/27202277604.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/checklist_format_for_housekeeping_hotel.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 5284 bytes
SHA-256: c429faf765edc6ecd3a9d74af511a2c16d58c6deb7f3f075be315a56ae39c35e
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 10776 bytes
SHA-256: 5412b00e0e013b77d56d66321f31bad5aa08abbc599b48ec2ac4ce77e305d12c

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