Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91ab7c5bf5eeae3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 10:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10cf06c753682ed4d1e3e073df4b0663 SHA-1: 07bc97232ff62ca8a8fd1483f4f4fe45cb7bb128 SHA-256: c91ab7c5bf5eeae3318551a68251c7d23d38f73e9cc0813f640ed62cd196d2ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting a phishing or spam campaign. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=open+app+from+background+android PDF link annotation
    • http://sbriz.ru/userfiles/file/pazejokik.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/mobusewisizadebu.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/32186250572.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/lisakosabe.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109012050113965.pdfIn PDF document text
    • http://stroi-sistema.ru/img/bemexovizeduj.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/40311280344.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/safefusin.pdfIn PDF document text
    • http://bankerz.in/qpic/files/pugefakosidudinudiru.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210907004930401.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161344041a8849---ziposagalimofomagoze.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zogig.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/46379582313.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/2072454537.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/74897188544.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/88049276845.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/53da641ab6996c5a44ffd2c533655e9c/rovetuvesaxatipatusafuso.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/77875885301.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/16133837076.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/10819556151.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/mizazenelixagaragu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/7876499541.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 17772 bytes
SHA-256: f4026f409c17c4c68a79e7ee7562b0f37bb770f6da1d272af0d322ca430f571e
font_02_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 11008 bytes
SHA-256: 74bea594a54e44982e03beeccbc21c57c0029f5a53ade84fb0ab85aa7eb32fda

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