Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8571ceb4fc17a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 04:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bec7c860553b372190c5551c1e3301d2 SHA-1: 8d2a96461df06801a814d1e963a66286a821e92f SHA-256: 13f8571ceb4fc17aadcf99d947caa3dfee83f5763a338e1e1267d4c38634ae30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=how+to+get+free+cod+points+in+codm PDF link annotation
    • https://fairtradeportal.pl/userfiles/file/71681030131.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109220407049283.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/979486335.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/topototuleliriruximurag.pdfIn PDF document text
    • http://aven.su/userfiles/file/94543507854.pdfIn PDF document text
    • http://envigest.cz/upload/file/wonuviwuparojotuxumoxuk.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/52673942632.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/45483488146.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/mexipuvo.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/9282538460.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/kigowidikemadodabi.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b88enqds47kuk03h9toujjhv6g/pilupukunomiliduf.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/9537827488.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/3015663976.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210913_075410.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/8759550726.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/xuzukufixanopanakudidun.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/gitukigukedalodexaboriv.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/65031144315.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/85851922124.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/62704027431.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/jexenowepigori.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/79319193535.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://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_off0000b7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F3 18748 bytes
SHA-256: d0f0171e58a2efbb3a7b5b995bc65d1bbce5f9de485c7985ed67b85b43146809
font_01_sfnt_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 10832 bytes
SHA-256: c56a8e4b934a20b7afd3edb9f6dda48e5395b34d46d1a36171b71478f990de4b

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