Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7ed37e5900ad81…

MALICIOUS

PDF

73.9 KB Created: 2021-03-20 04:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 882f6940b1b77b4f6667aebfaf371e0b SHA-1: dd2f9e8a53291cdc2545486444109b7e7fced04d SHA-256: cb7ed37e5900ad81fcc9f0f64761d2dd84b27c898769b0a209851e30ffb266d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=download+do+livro+branca+de+neve+e+o+ca%25C3%25A7ador+pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/f15ecab.pdf
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/47a44.pdf
    • https://lezojefob.weebly.com/uploads/1/3/5/3/135319065/vupakipole.pdf
    • http://mevatupumave.22web.org/cuisinart_keurig_coffee_maker_ss-700.pdf
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/kipanujab.pdf
    • http://zelolugo.22web.org/vonigigokepo.pdf
    • http://nawoxir.22web.org/silet.pdf
    • http://zuzimosutikume.22web.org/53825720541.pdf
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/tinepitojataza-zedorawake-vuwetumazeduxan.pdf
    • https://tapituxupali.weebly.com/uploads/1/3/1/3/131382330/jifidovixomeb_xekizugubukolaf_jagan_titunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jupudizadid/tonotarozekot.pdf
    • http://wawavubuwile.rf.gd/63744940532.pdf
    • http://pafomotaxo.epizy.com/sovojora.pdf
    • https://uploads.strikinglycdn.com/files/dea6befb-6632-4322-814d-4d2306fa6e37/what_does_the_mockingjay_pin_mean.pdf
    • https://uploads.strikinglycdn.com/files/e4f53028-c4c1-45e2-8b48-ea3deaed99d9/14866170325.pdf
    • https://uploads.strikinglycdn.com/files/d742f323-dc10-41c0-814a-661bed64b34a/jowezumidelajaforizisi.pdf
    • https://uploads.strikinglycdn.com/files/7df56318-123e-4828-a6fa-b89cdf8a306a/10588928987.pdf
    • http://bavejoxobev.epizy.com/midupizetinozufijubovemi.pdf
    • https://uploads.strikinglycdn.com/files/3eb1ff9e-bcd4-411a-8f3d-f378e1bc20bc/how_to_set_up_primo_bottom_load_water_dispenser.pdf
    • https://s3.amazonaws.com/bakoloj/50468257291.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_off0000d166.bin
259a71af613a334ce435db0dd17cffa05932eee50668fa84b17928ef886bbebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 5152 bytes
font_01_sfnt_off0000e2bb.bin
8d06a8a16312e05d73ba900cbbe10f3a4c4266aa3aa230a364a0eb199c599138		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 12628 bytes
font_02_sfnt_off000108fb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 4324 bytes

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