Malicious PDF — malware analysis report

Static analysis result for SHA-256 4438d97707746d4a…

MALICIOUS

PDF

85.5 KB Created: 2021-03-22 23:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5660b4308b7231cb20d065033a49067c SHA-1: 31f476244867f919e23ff93f54b77521d81aeaea SHA-256: 4438d97707746d4a277e108d93bf166658199d95d244c97b6dcc59d6bb5da3de
156 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one prominent URL leading to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to a popular game, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=homem+aranha+jogo+pc
    • https://cdn-cms.f-static.net/uploads/4445736/normal_604f2cb585bc8.pdf
    • https://cdn-cms.f-static.net/uploads/4403131/normal_6037b39d63c67.pdf
    • https://vuwarudud.weebly.com/uploads/1/3/5/3/135314702/powix.pdf
    • https://cdn-cms.f-static.net/uploads/4490752/normal_603441a7547c0.pdf
    • https://static.s123-cdn-static.com/uploads/4379482/normal_600496961fd87.pdf
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/pubifazun.pdf
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff4a0d9b360b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5557d326-6a22-4b50-8f9a-1d6835bcc0d8/3749690416.pdf
    • https://uploads.strikinglycdn.com/files/b3196f7d-a600-4df8-ad66-e409be28a318/xiguxuvesaripevirado.pdf
    • https://uploads.strikinglycdn.com/files/70bd47c1-8d2b-43c0-baf7-2c03ed4b1156/nowugagubimumigusoxifur.pdf
    • https://uploads.strikinglycdn.com/files/237c1a6f-65a5-4286-9973-9dae046d9937/can_a_poor_man_become_rich.pdf
    • https://s3.amazonaws.com/simujix/7400363092.pdf
    • https://s3.amazonaws.com/navoburarovada/gozeparatupifofi.pdf
    • https://uploads.strikinglycdn.com/files/b907adef-9260-4cdf-9f3c-b3cf1cea28d4/40447630653.pdf
    • https://s3.amazonaws.com/sojebelevenex/51730410758.pdf
    • https://uploads.strikinglycdn.com/files/eb87419c-d75f-4938-bcab-f9699b6d7b3c/que_quiere_decir_carro_con_titulo_salvage.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/gawigatigegilakitad.pdf
    • https://uploads.strikinglycdn.com/files/a4f5b10d-88e5-4092-b9d4-484ff24b087f/black_skin_white_masks_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/030db090-e0f7-4da1-989a-81dc106e19ce/80888400959.pdf
    • https://s3.amazonaws.com/bidivo/buy_kumon_worksheets_australia.pdf
    • https://s3.amazonaws.com/tiluwisulepam/video_from_facebook_iphone_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a5.bin
b0aa68a9704566ba02de1a8c2ea0e91b53bdf2eab07fd415db049b02ae478a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 4836 bytes
font_01_sfnt_off000112d6.bin
2f90391ab4837c3458b9e7cd1b914dc0c18ddaf71dc0ccc1a4bd46ae034ee703
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 12732 bytes
font_02_sfnt_off0001397c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 4324 bytes