Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f852831ff99c9b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-01 20:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32648d312ca96422765909d9ad0fd55 SHA-1: d3aa455d6187e056c1d9a2538acc985a8ee3f23b SHA-256: 12f852831ff99c9b43acf5fec53f79cd0dae93a5e5230ca12c1bd4f78d73e0e0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=wordly+wise+3000+book+5+lesson+6
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/4480653.pdf
    • https://cdn.sqhk.co/gepabafi/jcjeyqq/94787012123.pdf
    • http://jadogaxarabu.mygamesonline.org/presto_pressure_canning_instructions.pdf
    • https://cdn.sqhk.co/rojarimeg/ir8hfM5/70985564124.pdf
    • https://gusujosu.weebly.com/uploads/1/3/0/7/130775940/mimowelonebogono.pdf
    • https://cdn.sqhk.co/foxidagon/vggifgf/71710642673.pdf
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/8150709.pdf
    • https://cdn.sqhk.co/numiwuzuwix/jdjdEma/fury_survivor_pixel_z_mod_apk_happymod.pdf
    • https://cdn.sqhk.co/bewewojiwo/igRNKaP/ringtone_garageband_iphone_7.pdf
    • https://cdn.sqhk.co/bozutebux/ahchjQw/stokke_tripp_trapp_harness_installation.pdf
    • https://cdn.sqhk.co/lalamiteliw/dgijjVq/45504164905.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ronufabadexulab.epizy.com/bses_rajdhani_old_bill.pdf
    • http://newalutu.rf.gd/baby_girl_cute_images.pdf
    • http://tuxusar.epizy.com/gastroc_equinus_deformity.pdf
    • http://vekemelegewimo.atwebpages.com/tipos_de_comunicacion_humana_verbal_y_no_verbal.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca4.bin
61aad038a572e33ce05340b5365c7153584523e314179c7c0589bdf1d9c6fcee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 5604 bytes
font_01_sfnt_off0000efe8.bin
01f927458461a443e9c636a59572def3c38472ce2976800c97800c134debb10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10664 bytes
font_02_sfnt_off00011475.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 16092 bytes

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