Malicious PDF — malware analysis report

Static analysis result for SHA-256 13414f9f92dc1030…

MALICIOUS

PDF

141.7 KB Created: 2021-02-05 14:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd1899c848b1773ab0674bd6d993c9f2 SHA-1: 75b1c63cc69b67f213bbee2ce6318926a18f2484 SHA-256: 13414f9f92dc10301890e5730f2eea9fd313f18cc38e0fa9e9cdd24da607aaf3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://leonvi.ru/aws?utm_term=symbol+latex+pdf PDF link annotation
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/pubof.pdfIn PDF document text
    • https://ripumunilemaz.weebly.com/uploads/1/3/5/3/135302863/0dca6893642a.pdfIn PDF document text
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/5833959.pdfIn PDF document text
    • http://bitasifo.22web.org/76466711161.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/rabizebijel-pixitajuzosex.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/fgeAlL1/game_center_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/xaloridinef/jije0qE/neutrino_get_followers_likes_for_instagram.pdfIn PDF document text
    • http://ruzazeruduzelu.22web.org/58364963684.pdfIn PDF document text
    • https://garizoruzaxa.weebly.com/uploads/1/3/3/9/133986237/vakidimodukefo.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/ndLgiYJ/16336019516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzujodajemafa.rf.gd/lekirowuwamazoz.pdfIn PDF document text
    • http://nosijatigatu.epizy.com/mobelilobit.pdfIn PDF document text
    • http://jufakoxageponuz.rf.gd/17616806153.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/arihant_biology_books_free.pdfIn PDF document text
    • http://pavunununege.epizy.com/25647048602.pdfIn PDF document text
    • http://kopuperoki.epizy.com/zebavuxukoniporanudof.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/97760151290.pdfIn PDF document text
    • http://fupisetugib.rf.gd/abena_abri-_form_comfort_briefs_medium_m4.pdfIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE2 6388 bytes
SHA-256: 1d620ab49306fdb5b6052374e14cb35c629d459d6cea64e078f0432abd1978fe
font_01_sfnt_off00018a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A98 5324 bytes
SHA-256: 6374ad9a7f198620dc39c3755221597bcdd007e6d5ffee5e328f978be427fd67
font_02_sfnt_off00019c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C73 6316 bytes
SHA-256: 805f474a7a3efa0d586d2f9ef66621417ea721600d8aeb9d26bb785b494fe756
font_03_sfnt_off0001abe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABE5 19088 bytes
SHA-256: ce5ea44073298adc87d6eab09bf5f30bfc92b3e9949debed8a267ba5a4d0f881
font_04_sfnt_off0001eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EADF 24468 bytes
SHA-256: 09c54da94a1f2f41520e145d3bf6b0eea06369a4c5820efc59792fbcd51e3427
font_05_sfnt_off00021880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21880 6260 bytes
SHA-256: e1f7d7bbfd45d41895dfa988f1de298f4325d0244d616821d075ad115046f75a