Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb560ba233489cc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 14:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8ff43ae388251b62373be903e62d247 SHA-1: 4fedd1e310e99d3f20a92a9a2f6e002ef18d9f9e SHA-256: 7fb560ba233489cc07aacfff5445ded70a360af1ee33ac70737256db37e5671e
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. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on potentially disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://travellifeafrica.com/ci/userfiles/files/50798710674.pdf In PDF document text
    • https://groupburuemas1.com/contents/files/poduvate.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/xebogox.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/20528316737.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/31766093747.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/34262760853.pdfIn PDF document text
    • https://kopari.hu/files/file/32405971697.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/14408328614.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/fidixufu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/dexexemepowufofuzupema.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/memeravizir.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090620055173499.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a970d43aff---vufel.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xuguteteratoxidupil.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/gatin.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/14761497230.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/68475209195.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/78648827767.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/toripujukegoxovezuru.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/15760159325.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/58030572533.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea682d85b---wirapebozipure.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/93117382876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=podcast+para+aprender+ingles+androidPDF 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10692 bytes
SHA-256: 1c6a53f4dc7b1fe46b584a0695ee9fc6802f0774be395f75726cbda11c36d533
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 19888 bytes
SHA-256: dee97448860c4dec434592865e9c526534cdb6c76abda165287e461235bad862