Malicious PDF — malware analysis report

Static analysis result for SHA-256 f827b49484604324…

MALICIOUS

PDF

73.6 KB Created: 2021-03-05 14:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e2d4d4d372d73667c861fb5f282087e2 SHA-1: 758a9705e2dd0e1608315e11ec6af36003f4076f SHA-256: f827b49484604324accc50fc118dc53940f0d284ad42adc312cd65291bd981c3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=how+to+test+smd+diode+with+multimeter PDF link annotation
    • https://cdn.sqhk.co/pamavunawi/zHQIjd8/animal_sounds_at_night_in_ct.pdfIn PDF document text
    • https://berigagagek.weebly.com/uploads/1/3/1/3/131384675/zipuvunibuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/jgVgdMK/wufobofoximonira.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/iarkkiX/63368634181.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/wudez.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/a80093a9-b057-4384-8867-11d2ea56c7ba/dujesozadigejiz.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_3faed23578294de0a6f54b24723a17a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/how_to_write_effective_ad_copy.pdfIn PDF document text
    • http://miviloliwibo.rf.gd/what_does_chemistry_in_spanish_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/moduribonetemojivit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa40b64-6513-41b6-8101-b180b5b2b888/how_to_pair_resound_bluetooth.pdfIn PDF document text
    • http://pazatirademe.rf.gd/acer_laptop_wont_turn_on_without_battery.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_b9e1bf0002ed42d1b7bb9f4b4dec52b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/vmware_vsphere_hypervisor_center.pdfIn PDF document text
    • http://jalasofumikom.rf.gd/34415230451.pdfIn PDF document text
    • http://zofigofaka.epizy.com/infinitive_or_gerund_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/street_of_fighter_4_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/37111076199.pdfIn PDF document text
    • http://fegumipidibig.rf.gd/2216632994.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 4908 bytes
SHA-256: b9353f56991a93882274f76a78ebaa10b9a0db429cc24823c7527d3c5417bb38
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10552 bytes
SHA-256: f3215726fda7d2f3bc3a6d45d2a5c71294dff92bc2362e0b3bc841e871fd31bd

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