Malicious PDF — malware analysis report

Static analysis result for SHA-256 822f830f2fd8c987…

MALICIOUS

PDF

83.6 KB Created: 2021-03-16 22:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 254cf38744a11b395dd7d542550c31d4 SHA-1: 5c3c70fe2433fcdcdb0747b175895e02de8bcbb5 SHA-256: 822f830f2fd8c98796242ee9b59167f765731f59e7ec50d3e266a88e06bc3c8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting it functions as a link farm. The primary malicious URL identified is https://pelibifir.ru/wix?keyword=thermofuse+for+an+elite+deep+fryer, which is likely used to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure and link farm heuristic strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=thermofuse+for+an+elite+deep+fryer PDF link annotation
    • https://cdn.sqhk.co/zikoxazobe/ca2Xhh6/xapadigokawolifurab.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/15c320b.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/WiaghCK/peter_rabbit_po1504_talking_plush_toy.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/NkZifgc/parent_approval_letter_sample.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/dfeefda06fc.pdfIn PDF document text
    • https://cdn.sqhk.co/jarutejip/dgjA6d0/joining_report_sample_copy.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/tinezedu/how_to_replace_trimmer_head_echo_srm-210.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_28d9646f57ad431185b77f372d3ad2a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/39695217257.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/33485144417.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/baby_crying_funny_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/the_apology_line_podcast_theme_song.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/16520857420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/658542ca-6684-4cc4-aba2-3805d7d0055e/how_to_reset_a_water_heater_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/kurupijovagavadoludubuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d363c98-3ea9-4fb3-bf1b-dd681229531a/17415643233.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/south_carolina_dmv_hazmat_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd75fee2-e8e5-48e8-a8a4-fd8740969615/the_happiness_equation.pdfIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_1e5a0edb7fe341c9bec9b4f92d69cf9a.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_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 5332 bytes
SHA-256: 36256dea957bc680bd19ce75600b9770a01ee590345855120f1b927e3e35db1a
font_01_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 10616 bytes
SHA-256: 3733edfba285d5fecd7799e0b8cd38a20da65c9ee7623ce51c75bb28491430eb

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