Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e94252870d92276…

MALICIOUS

PDF

81.1 KB Created: 2021-02-17 14:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 743edfa1598057104e2e9858fab9d962 SHA-1: a654189b7304dcf4d5db99f9ba3c9ddce183ed05 SHA-256: 9e94252870d922762eaca49a873fe1a373b75a1a77887c5df5eef53c0e80e617
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly benign files, but one primary link to 'bologen.ru' is suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links were generated, suggesting an attempt to manipulate search engine results or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were explicitly extracted, the structure and link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=parts+of+a+circle+worksheet+geometry+answers PDF link annotation
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/buliwebu-lojipezuwopek-falogovutiper.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/gonogodadinejujodu.pdfIn PDF document text
    • https://jazowamiwig.weebly.com/uploads/1/3/2/7/132740249/wegafusatezepafotiso.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/bokapifamojam.pdfIn PDF document text
    • https://zetojaxonafavop.weebly.com/uploads/1/3/5/3/135309172/rademo_novozuxawezu_bejoki_zukekezajixar.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/6577278.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/6366651.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/6926db.pdfIn PDF document text
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/ac8df7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mejifavo/apna_time_aayega_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jazoguvaxofezitikutizoju.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/matching_upper_and_lowercase_letters_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/ditedofuzuvake.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/anti_virus_smadav_di_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/converting_direct_speech_to_reported_speech_worksheet.pdfIn PDF document text
    • http://kidogip.epizy.com/vba_application._worksheetfunction_list.pdfIn PDF document text
    • http://kabofed.rf.gd/chotta_chotta_remix_song.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5344 bytes
SHA-256: 8e7876e335da8ffd25c009c382f81000951c614a4daacf76e01162bb57bff703
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 10972 bytes
SHA-256: 11038e9a5c0480bdd3adb0095aa531f7605375963a80544275137e4b0a8e855c
font_02_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6
font_03_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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