Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7b03a83dc934d6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-26 08:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c196d4bb787e133b867a63dd8eee7a7 SHA-1: 4e286ca4e1b4de82f646ff871c1847d9a2bbb3a4 SHA-256: ac7b03a83dc934d6d82622510c0c33c4fa4607fd7f4c0f5e2cef10a1eaa28e41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://portalpr-b2b.es/img/user//file/_0416933001630976208.pdf In PDF document text
    • https://nstyapi.com/resimler/files/zerabezoletepiwofopaz.pdfIn PDF document text
    • http://specialcats.nl/media/files/pipak.pdfIn PDF document text
    • http://hanleyresources.com/images/geronaxirewotupus.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3859246c1---jepobafagekuzefesipoge.pdfIn PDF document text
    • https://datawire.gr/files/files/menesepikonow.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/77284669324.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/majipobabevuditi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wativorixaxoledo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1f75ef7b---27918376584.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/sonudimunitobanepoke.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/61714116780.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/salopekupidepit.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/90084175218.pdfIn PDF document text
    • http://synfarm.com/upload/files/44620518605.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/lupimukisojawo.pdfIn PDF document text
    • http://josquin-capella.de/download/76952876009.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/fubunujafoku.pdfIn PDF document text
    • http://saglamahsapkutu.com/img/editor/image/file/94129886004.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/20259331385.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/64768843215.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/marimagatulewu.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/lokiwefonovojas.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/zolemijefutir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=design+editor+is+unavailable+until+next+gradle+syncPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 21584 bytes
SHA-256: 6d06dc17ecd7291099dac05cd94565db10252d871c963f402862b425979274df
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_02_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 11068 bytes
SHA-256: 77764c87b14aa45b2f9ce861a7e0dd1153246c5ef8c5d276f053a42327810829
font_04_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 2308 bytes
SHA-256: d1bd0ea432ca11131d84357bfb23a5e29dacc3070734c28198e1b7db97453d05