Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94913f57dba6e45…

MALICIOUS

PDF

73.7 KB Created: 2021-03-30 19:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6582821c443e0ce774e2f4594cef0d69 SHA-1: 57d34b001071602f70cb88fb898b3080ee0bf890 SHA-256: f94913f57dba6e45adadbe3c369c117cc1a98848c9578298a5178308b4192c46
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristic firings indicating malicious intent, including a high-severity PDF_RANDOM_URL_LINK pointing to a suspicious PDF file. The ML classifier and ClamAV also flagged this file as malicious. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site or download further payloads, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://botokaw.ru/award?keyword=10+essential+amino+acids+pdf
    • http://wogivodugakovek.mygamesonline.org/xijuzizapokadut.pdf
    • http://com-connexion.xyz/50007984161x52lr.pdf
    • http://apparently-home.com/54768973023y1p53.pdf
    • https://cdn.sqhk.co/tuwovado/DIhWjg6/icy_hot_patch_for_neck.pdf
    • http://bijepitujutix.sportsontheweb.net/phase_2_phonics_worksheets.pdf
    • https://cdn.sqhk.co/natefisaka/chgjbVH/19706185420.pdf
    • http://bestunew.xyz/dsc_alexor_external_siren_batteryhpvyb.pdf
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/pimepizuveru.pdf
    • https://fakerotukipi.weebly.com/uploads/1/3/4/3/134376647/vemukelekinof-xinetipajeki-gajowukorag.pdf
    • http://domavera.ru/gomevagabevogububiwagexujcfpyu.pdf
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/8bf6c2098fc8cf4.pdf
    • http://idealicaufficiale.website/35531648644c5zoq.pdf
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/b3483.pdf
    • https://cdn.sqhk.co/fenazijeguk/SDibied/alien_shooter_2_the_legend_repack.pdf
    • http://jikusofare.mywebcommunity.org/pipiwetukilunavesemuwiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vujipopeb.rf.gd/the_tempest_movie_in_tamil.pdf
    • http://zitabuzujo.epizy.com/25714110479.pdf
    • http://xamawesurasido.epizy.com/gilded_fossil_guide_poe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fa.bin
6c3c0a6bded2159e184ecc810898e013204ea2d68da612d3356bcc80eca44d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5304 bytes
font_01_sfnt_off0000f6fb.bin
2db70fdc8065b776bcdf244793c3189a15b3d2b6de2f53afc8c53ebab5569894
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 10264 bytes