Malicious PDF — malware analysis report

Static analysis result for SHA-256 213f288add2513d2…

MALICIOUS

PDF

76.2 KB Created: 2021-04-20 06:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1365322c239532b461a0a6b1d5a6a97d SHA-1: 83c920134180568763074cca185bb9b0e84f71e9 SHA-256: 213f288add2513d2fb0f48ff5fefbb0579743d6fa0e8bd799d6bbb2f2a32be49
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://kuzutuzo.ru/strik?utm_term=cuantos+litros+son+un+metro+cuadrado, suggests a potential phishing or SEO spamming campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=cuantos+litros+son+un+metro+cuadrado
    • http://phtech.site/how_many_calories_to_lose_weight_chartgtktx.pdf
    • http://nomofugosep.22web.org/74141518452.pdf
    • http://goproonly.com/pafufufimadabjevw1.pdf
    • https://cdn.sqhk.co/wubunepan/VVugjhL/dujaxoto.pdf
    • https://cdn.sqhk.co/powurejur/BgeiiJc/zilukux.pdf
    • http://lami-lashes.site/8825778168127mc8.pdf
    • https://cdn.sqhk.co/zumedizojas/y7hjNhg/poughkeepsie_train_station_to_grand_central.pdf
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/tatakeboxu.pdf
    • https://cdn.sqhk.co/gofelaxes/eatib7d/you_had_me_at_hello_ukulele_chords.pdf
    • http://medicalpracticementor.com/pabusolowarafajunidife074fq.pdf
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/4278553.pdf
    • https://cdn.sqhk.co/povuguzuloga/zuyifgj/paypal_customer_service_email_address_usa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jexijer/60603969404.pdf
    • https://s3.amazonaws.com/sasufufa/tinumiwatenozef.pdf
    • http://duliwijedij.rf.gd/26342731331.pdf
    • http://xetulugesoboko.epizy.com/94814001767.pdf
    • https://s3.amazonaws.com/nilafafakem/52102127011.pdf
    • http://deravamosu.rf.gd/parovenuxafebovoga.pdf
    • https://s3.amazonaws.com/memexelu/97699645303.pdf
    • https://s3.amazonaws.com/dewazewokib/the_heirs_episode_11_recap.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_off0000e92e.bin
75e026947c68a000b45ba8a7556326694f39b7570d40a9f1bc2728e77ee0b525
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 4992 bytes
font_01_sfnt_off0000fa06.bin
fa04319f0dad47d3bb5d05e697ff7f0dd18b7e1feadfffdaa672233380690adc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 12348 bytes