Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d48723dc7c961b…

MALICIOUS

PDF

99.5 KB Created: 2021-04-14 11:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3faa4a7c2b1f3d437487c4b2bea1298 SHA-1: d932b826ad4db31493429d1aa9362522963e0305 SHA-256: 58d48723dc7c961b89d9926f5ab04cfbff14512f8c4c458276f8254fc67d5dae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains numerous external URIs, many pointing to disposable domains, and is flagged as a link farm. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=nvc+universal+needs PDF link annotation
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/870a98895f27c6c.pdfIn PDF document text
    • https://turudesufexo.weebly.com/uploads/1/3/4/1/134131379/gutuwoton.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/Q2hbr2v/92923808905.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/FsLejc2/weladuja.pdfIn PDF document text
    • http://punalavivex.22web.org/high_school_physics_textbook_mcgraw_hill.pdfIn PDF document text
    • http://rizuxikasosokeg.22web.org/soloxamevojekari.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/EijwdfT/life_simulator_2019_roblox_link.pdfIn PDF document text
    • https://lasomuvexovip.weebly.com/uploads/1/3/0/8/130813571/kanabuna_wubezebuwino.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/hjegfhn/60679750668.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/jhbJHic/carrier_split_air_conditioner_manual.pdfIn PDF document text
    • http://pusokum.66ghz.com/43880551603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af0bc7a-55ed-473a-833f-50a1295e66b8/vabexepepafobogi.pdfIn PDF document text
    • http://rikovinob.epizy.com/guliduta.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/biology_class_10_ncert_answers.pdfIn PDF document text
    • http://winixugerefubu.epizy.com/norosezolimusefosoropod.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/where_to_watch_season_2_of_discovery_of_witches.pdfIn PDF document text
    • http://firixafuzive.rf.gd/26605672611.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/bottle_shooting_game_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2072ce9-0165-4dc0-86aa-89e54eadcb77/books_about_being_at_peace_with_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/keuntungan_local_guide_level_7.pdfIn PDF document text
    • http://pegolika.rf.gd/zakiba.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001485a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485A 4960 bytes
SHA-256: 8975e48d8c9ff4df11729081d6b183d17aeb02039913a34e3935b34480956af0
font_01_sfnt_off0001594e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594E 11968 bytes
SHA-256: 85da1542a61cf426db67399296202c65919f9cf5a474fe7236b4c6d7b17c5091

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