Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34091ac3b78e57b…

MALICIOUS

PDF

94.0 KB Created: 2021-09-16 01:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bf02c4581dcd2b8aa5a8faff66f607e SHA-1: ea9a3abb15c822f772effde24e40d5b6a11ef583 SHA-256: a34091ac3b78e57be8682cb6202dbd984e1d4ac9efc87423a27b7007600d49e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://autoscuolapezzano.it/userfiles/files/94088405518.pdf In PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/21018325558.pdfIn PDF document text
    • http://secretinvitation.net/images/files/79378287383.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/87400794101.pdfIn PDF document text
    • http://liily.jp/upload/file/20210911225713.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/72499117553.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/deposupajavojozi.pdfIn PDF document text
    • https://htchninc.com/d/files/vakusujajodipadi.pdfIn PDF document text
    • http://cissi.it/userfiles/files/wovexazatizatirajo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161362d4a3ee78---80951446299.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/82963619796.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/56227994823.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908174855.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zinazedotovibaw.pdfIn PDF document text
    • http://baoveantam.info/upload/files/januvukevige.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/turexomi.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/badizogajafurazu.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/41540000364.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/83846237174.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140dcdee54fe---3119113974.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/kisiwosoterinufematokaken.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/42620079071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=555+angel+signPDF 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_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 10004 bytes
SHA-256: 23152ad497c5476c04fcfb64c3e2fba867d4731b1fb5daa21808c771fe74aeda
font_01_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D26 17840 bytes
SHA-256: 1cd8273ba817b60c57a99ad2308e073bde6cd4b0a75227dbb015f4e0b7798f29

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