Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81fc8f52c31ff23…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 21:19:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a075635a60ed37433b8094264609537c SHA-1: 2580a35700d7dfb38dd48b7dad5f806aa6e52532 SHA-256: d81fc8f52c31ff2308edabfd07555ad62c69e6016bd7ff14b227f8fb07cae96e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on cloud storage services and appear to be part of a link farm. The primary external URI points to a URL that includes a keyword search, suggesting a phishing or SEO manipulation tactic. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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://ponafet.ru/wix?keyword=unturned+weapon+holder+id
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/a27089003a.pdf
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/xekuv.pdf
    • https://botimosiwipam.weebly.com/uploads/1/3/1/3/131398053/wegejefinidasa.pdf
    • https://cdn.sqhk.co/dejuxafe/dhgggja/xofito.pdf
    • https://cdn.sqhk.co/divoxisig/TwgijdM/15661501603.pdf
    • https://vugopese.weebly.com/uploads/1/3/0/7/130739154/e1360411cb626.pdf
    • https://cdn.sqhk.co/jupozaregu/oQKifTy/dirt_bike_racing_game_download.pdf
    • https://cdn.sqhk.co/jolekusij/mjfWjdk/5389501864.pdf
    • https://unturneditems.com/metal-rifle-rackItem
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dikobepibelun/gonebufapadub.pdf
    • https://uploads.strikinglycdn.com/files/97b66e40-b862-4841-9d62-310f20a23baf/kagagalex.pdf
    • https://s3.amazonaws.com/mixanaz/fovogabe.pdf
    • https://s3.amazonaws.com/jozetej/magipafujufudibabu.pdf
    • https://uploads.strikinglycdn.com/files/31b49eb3-5844-46c3-b898-ea17f30796f4/how_to_describe_fluffy_clouds.pdf
    • https://s3.amazonaws.com/tafogusegabomu/sad_whatsapp_status_english.pdf
    • https://s3.amazonaws.com/jadere/76152849553.pdf
    • https://s3.amazonaws.com/nonabafat/english_grammar_course_oxford.pdf
    • https://s3.amazonaws.com/xezonijida/my_hp_printer_wont_shut_off.pdf
    • https://uploads.strikinglycdn.com/files/7f85011a-90bf-4016-afa2-9af1a505b11a/readynas_duo_v2_disk_compatibility.pdf
    • https://s3.amazonaws.com/desenaz/s_b_deorah_college_uniform.pdf
    • https://uploads.strikinglycdn.com/files/4812d9d4-6474-4df5-a234-009e05157ae2/xakuwo.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_off0000e1dd.bin
35d9a44e7729d45cff9f07ef6014d4b3185577c299de96f279838edacfeb7e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 4836 bytes
font_01_sfnt_off0000f24a.bin
86f526577894bac8ca20e88345782f2c8b17f86609cb65705c6c330a4974721f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 11428 bytes
font_02_sfnt_off00011929.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 4324 bytes

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