Malicious PDF — malware analysis report

Static analysis result for SHA-256 28413ea47b2ea75a…

MALICIOUS

PDF

89.1 KB Created: 2021-04-02 02:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d10f5aaaabdfdb02b00a7a2150f4fa3b SHA-1: 85d977ab7fa7eea58fa34e1e2ac7e1f847be68a9 SHA-256: 28413ea47b2ea75a8d7a4132494ad9f58a7acb89b3636341ad54a972dffacd43
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a link farm heuristic firing, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a URL related to 'pokemon battle game apk' in the document body, combined with the PDF_SEO_LINK_FARM heuristic, points towards a phishing or malware distribution lure.

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://zajinet.ru/123?utm_term=pokemon+battle+game++apk PDF link annotation
    • https://marodesama.weebly.com/uploads/1/3/5/3/135349202/6c797519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394071/normal_605d9c2a2809a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_604898b937f75.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/m-audio_code_49_usb_midi_keyboard_black.pdfIn PDF document text
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/pudaromekajatax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_603097e31a814.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/muvuv-nexedadekox-wanigupe-komelixituwuz.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/zalisujezajaje/bike_race_game_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f92a5630-75c2-4911-9603-a64a0d870f0f/1762_if4_scaling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f2fa13-93e4-40b9-a073-e3302c8173e3/74306143986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a080dda2-5b24-4a0d-8670-5092aaac1275/william_blake_the_tyger_and_the_lamb_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/shazam_pro_apk_mod.pdfIn PDF document text
    • http://fazatela.myartsonline.com/56303675158.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/dukuzikometivaxuzovatel.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/dragon_booster_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/abu_dhabi_police_logo_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/feribomidigikumisa.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/microsoft_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/baby_boy_cute_pictures.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_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 5068 bytes
SHA-256: 5c7a3c8516ac5e44bda1d5a172dc4bc2a40fae8d7d001a312511b1100d93c495
font_01_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 11728 bytes
SHA-256: 9b8e0256121d3b40e45647ca8f721e61cc163dd85b057823d18d808ef0e55740

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