Malicious PDF — malware analysis report

Static analysis result for SHA-256 15342ed23debc0c4…

MALICIOUS

PDF

123.5 KB Created: 2021-03-11 07:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6bcf298f0e81886f05956691db38a684 SHA-1: 7262dc65dfdc855bf771a923df283c166329bebd SHA-256: 15342ed23debc0c44cf538aa69729a0c5c8243236e2d19462cd502b82b497c53
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest potential for further malicious activity, possibly involving embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/strik?utm_term=nato+phonetic+alphabet+printable+version PDF link annotation
    • https://cdn.sqhk.co/bulelovuroga/cc7geNU/pinata_smash_cake_ideas.pdfIn PDF document text
    • http://gosasumimak.iblogger.org/nuzenawaxiwiwopixo.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/arkitektura_shqiptare.pdfIn PDF document text
    • http://tawokurabugo.22web.org/zoxakur.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/asus_maximus_iv_extreme-z_bios_update.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/R3B85jj/cosmoprof_hours_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/rLLhbkM/wizukadozefesisaropoj.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/graco_modes_jogger_se_stroller_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/RhchgAz/36841968303.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/4hfKjqo/nujakanolewoga.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/edjaMib/zubale.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/akjakjj/social_thinking_skills_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/rudugebakivo/gjvmhb1/suzufogisusoti.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/radefomofene.pdfIn PDF document text
    • https://cdn.sqhk.co/fusifanux/hifjg2E/deathrun_portable_mod_apk_2._6._2._1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://faxevimisosideg.myartsonline.com/uscg_weight_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fed3ef-0bf1-4eb1-a6a3-e674def11673/99_names_of_allah_with_meanings_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff0f887-09b7-454c-944e-7213e666ea28/how_do_i_charge_my_beats_studio_3_headphones.pdfIn PDF document text
    • http://fujexineduronas.rf.gd/28896387157.pdfIn PDF document text
    • http://bopadobaxu.rf.gd/first_grade_math_word_problems.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001aaa5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AAA5 22648 bytes
SHA-256: 21a1d01d30ee73b45ffc0074e5ea5a0cee33fe6bc26fa12beea6098bc1d3e527
font_00_sfnt_off00016a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A17 4976 bytes
SHA-256: 7c63f9e0288db446bb2becb548bd7f50d6762054848d9bfdebe8fa39fd8e52e3
font_01_sfnt_off00017aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AEE 15968 bytes
SHA-256: a13f6adcaa86b917f8e0fd6107208ca70cc6aa0c79f005820cd29beb9f7047b7
font_03_sfnt_off0001d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361