Malicious PDF — malware analysis report

Static analysis result for SHA-256 b177c0fb7fe7edf0…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 18:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4955899d64de11e5e3066a3dd67513f SHA-1: 39343ecc3c5550ba5ed91c4c3b89b8765162e8d7 SHA-256: b177c0fb7fe7edf03205b28f44910f949d8d5d1a1f05bd590050d63a22bbb566
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138aec99e3ec---89618616900.pdf In PDF document text
    • https://pgprojekt.pl/Upload/file/81565656398.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/juwujosaxazudeb.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zudidijuboved.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140797f638a3---23194494506.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/84171026032.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/82602785691.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/denonosajenaviwukokunabez.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/momub.pdfIn PDF document text
    • http://teakdeck.pl/files/file/berivamabozo.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/pekakinegelotem.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/57474259117.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/96541207609.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/97193446567.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/54991619716.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/liputobaliki.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/tasof.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/95249799859.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/13222105012.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/femilojagidepuxonamikobog.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/29912777328.pdfIn PDF document text
    • http://offerparts.com/upload/files/73611436318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hello+neighbor+apk+2PDF 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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 10608 bytes
SHA-256: 841b8dcb31dade79158778c2cf69295d581389b27c8e4bd831720baf7f4da170
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 16596 bytes
SHA-256: afe22972e03979d437965f703f09f3cc3f696ddf26f41f865d9d06f48d3ef5d8

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