Malicious PDF — malware analysis report

Static analysis result for SHA-256 022c5b783c987136…

MALICIOUS

PDF

89.8 KB Created: 2021-09-16 17:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0eba6a2c33d0ae5ca56a8364f133725b SHA-1: 843e620b57c8a166057fb3a8001d36fb07c978e5 SHA-256: 022c5b783c9871361c61e9b63f578246d145d3efefd7bbd68f640327dc5f4998
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the presence of numerous embedded URLs pointing to potentially malicious sites supports the classification as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://yjeverspeed.com/userfiles/file/ruwedir.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/1283513594.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rifopiguluzujuredikiz.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/fekosuzumurazarus.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/jamivovijusadulaj.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/87215755845.pdfIn PDF document text
    • http://elsped.hu/files/file/34867825222.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/balilukaxolerubawomana.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/dakegeted.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/guzan.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/wanizimibunasim.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/lugafezanijak.pdfIn PDF document text
    • http://szwygs.com/upload/45841487018.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/kavulugujanufar.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/verimawejedumufejigised.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161389020cda34---69993367094.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/92196739860.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/65653043634.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zijepe.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rofufasuxa.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210910065515545152mblso.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/28521829970.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4a972961---mifogusok.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/7200105336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=not+another+teenage+movie+full+movie+2002+english+freePDF 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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 11048 bytes
SHA-256: 369339645bfddd6324bda435c00d212addff6df00875f0b1e0b2de258725713b
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 18936 bytes
SHA-256: e8ed18ea7ca2937002218d54dec2e3f8ff9821613fe3b81a791f002d53e1220c
font_02_sfnt_off00014129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1