Malicious PDF — malware analysis report

Static analysis result for SHA-256 911dff6c97553f7a…

MALICIOUS

PDF

95.8 KB Created: 2020-11-19 14:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 95e7cef0301973f62b62d19a33d17449 SHA-1: 166681689375acd1d06576f117459bdf7fd05437 SHA-256: 911dff6c97553f7a841f2528d2fb4c4b0eafef5b7874236a6cad172b151d7e2f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=our+endless+numbered+days+chords PDF link annotation
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/0fa032899c06b.pdfIn PDF document text
    • https://mogawurid.weebly.com/uploads/1/3/4/0/134042680/kemoxu.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/289198.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/gedesisumi/orbit_sprinkler_timer_manual_57894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615eedfd-3b97-4485-83f1-32b019473421/fufojiladedegejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999df7e9-032a-4edf-abb5-62217a56224b/bobiwewelajuzoresonajato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a95ce6e-2098-4392-9ccc-d25e9eafdc76/mufef.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/99677159154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/418d29fb-3727-4320-8835-332368382bc5/68488167402.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/kuwesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d4a574-bf96-4c13-839a-8202aad022d7/papudip.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/amenaza_de_aborto_fisiopatologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8597428-14d1-4a12-82a6-965cca42580c/89325802251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb54a31-edf2-44c5-a97e-85c3e06437ab/the_columbian_exchange_effects.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001434c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1434C 27332 bytes
SHA-256: b709ec59ce164df4a607765e16833dc4e368c84620e7b77e1049accab93ad732
font_00_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 5448 bytes
SHA-256: 16da1500cdab6bd4fb69df9c3876f83b89d7a1ca127fb80a507b497647c9c76a
font_01_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 11384 bytes
SHA-256: 9443aa8fadcc0f9b21c5efdc3d8b99e5cf0f7ad9081959a0e77d2ee712ff9b34

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