Malicious PDF — malware analysis report

Static analysis result for SHA-256 31af1beb35950df2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 08:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2078085c3bcc06ba1fc32128f340f70 SHA-1: 1101ddc01ca3df196fd513a7d8f72c5eee70cf90 SHA-256: 31af1beb35950df2ad714cc515e2d0715a31526e7bcc2aa429731e6792f93512
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically pointing to a potential lure related to 'mobile legends next apk'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crysiq.ru/uplcv?utm_term=mobile+legends+next+apk
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5l6meeeus86h51io67ms8j0i8f/bivonetidaf.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/91149983075.pdf
    • http://www.gpe-el.pro/ckfinder/userfiles/files/nopuvi.pdf
    • http://ventexevent.se/uploads/file/83342939937.pdf
    • http://glampingcaravan.com/userfiles/file/20210904010443.pdf
    • http://piemonteforyou.it/userfiles/file/virinozoxes.pdf
    • https://efficimm.fr/userfiles/files/xewob.pdf
    • http://gemcom.org/userfiles/file/4064836293.pdf
    • https://dm288.com/slicice/file/94899455362.pdf
    • http://multi-accueil.fr/ressource/site-image/files/49260937383.pdf
    • https://rovetco.com/userfiles/file/kidobujivimovidim.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/751e476b6bfd35ded2fdd937bbf65c94/75189133354.pdf
    • http://wwm-quanta.com/upload/files/lewovedafevixika.pdf
    • http://alhouti.com/userfiles/file/dazitukibososela.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/tuginajope.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47996915029.pdf
    • http://www.awakohchang.com/image/upload/File/0669927801.pdf
    • http://studiotecnicoforace.eu/userfiles/files/gatekubalamive.pdf
    • https://dolmalatrek.com/userfiles/file/fomup.pdf
    • http://metrominicabs.com/survey/userfiles/files/sijugadifotunaxiwezonaw.pdf
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/zugelan.pdf
    • http://mai-colle.jp/userfiles/file/55009635634.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/82186046142.pdf
    • http://licausi.it/userfiles/files/20898420024.pdf
    • http://sinocelltech.com/filespath/files/20210921000144.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 16792 bytes
font_01_sfnt_off0000fe59.bin
33817bc7c0fd25639242b5bc9a94d2c5b5ad63850f8aa9742d0ee69f551c615a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 10792 bytes
font_02_sfnt_off000116e6.bin
2e2966603dd25353ed556e25db3135796cde94c711744d14ee0d100892e237a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 17576 bytes

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