Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aabca2f34f40d4e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 00:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c0b589081655ae44b3177d325f6e9068 SHA-1: 2d992988f6c30c8b0b1e17210174bf851dac04a4 SHA-256: 3aabca2f34f40d4e54379d97957c27d0637452ec3161896a9b6ec9ca6ece32e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of multiple suspicious URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd640548b---33259265455.pdf In PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/sevefaropasuxatotun.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/wodokisudoxepigudeb.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/wawivurojumetoxutofu.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/14325097964.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/tijuwazagunubozujil.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/soruxedodun.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/75380595215.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73183401357.pdfIn PDF document text
    • http://mobilenmr.com/files/files/9437560033.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/defimusedutovavotovomizi.pdfIn PDF document text
    • http://podushka.by/files/files/12298068495.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/dedivuterekumes.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/41043185370.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/30237743765.pdfIn PDF document text
    • http://xhzhengli.com/upload/jajudusokudodezom.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/34224727339.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/powafonunuxufibigafu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613678c06402e---14515679710.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/57718832047.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zelegotizavobim.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/6192264082.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/77726375733.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/50729944280.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/35300164957.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/59275489094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=send+location+android+to+iphonePDF 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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 10516 bytes
SHA-256: ec2af91a454983d1557ed205686c4c42c677b6de1b5d350a890e7eeb4ebad179
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 17180 bytes
SHA-256: bb529e5161658118ed57ce81495a3d15b927f7985ddf4a0d8cc94bce6a05b8bf