Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07ac2acbdc77cf4…

MALICIOUS

PDF

67.5 KB Created: 2021-09-16 01:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fb837514a3bf1c62ce8a65610462d2a SHA-1: 32334b905791bc299ec0aa549bc9ce5ca68a814e SHA-256: f07ac2acbdc77cf49633817b31c7b15df296251486f31d0ab84c48ba949d2324
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for other malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this behavior, indicating a tactic to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://elma-itc.ru/!upload/files/48165823070.pdf In PDF document text
    • http://portalpr-b2b.es/img/user//file/_0143317001631422314.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210910030056.pdfIn PDF document text
    • http://garderoba.sk/images/_file/10823073144.pdfIn PDF document text
    • http://woykoff.hu/upload/file/75615472529.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/42850033042.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/busaragoboga.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/60835574940.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/49660316485.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379107c1409---wegiw.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/vudonupupevi.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/devosisinufavebeb.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/15721042266.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/34253334292.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/mojaxof.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109020434324303.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fajoxowoparofesowimuta.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/nibupisisutobusazafexo.pdfIn PDF document text
    • http://talesma.com/E/file/lijuzurazoxabapemumaken.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/32123565526.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/94061320331.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///numujajugiveni.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/8551205542.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/ximelitedamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=need+for+speed+obbPDF link annotation
    • 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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 14384 bytes
SHA-256: 73aff463b62cef39223fe73d34f70b94e81472a46bf513266abbdb4441378fb8
font_02_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 10104 bytes
SHA-256: 472ecfa89d368641f8713c536591569065d8a2362b40ece4009575d44b1d5e02