Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016096627bd285a…

MALICIOUS

PDF

75.5 KB Created: 2021-05-31 20:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd463007ded6f342fffa150257c3e118 SHA-1: 7722658a893367bf9a62e405389665cb0065793f SHA-256: f016096627bd285ae4e1628d6e50db46d960e4787ccb9aa94e785989cf9983b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external links, 'https://infrive.ru/pbw?utm_term=how+to+give+reply+for+job+offer+letter', suggests a phishing or social engineering lure related to job offers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/pbw?utm_term=how+to+give+reply+for+job+offer+letter
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/3759399.pdf
    • https://tanipodolotuweb.weebly.com/uploads/1/3/4/4/134457000/watokuwilezesu.pdf
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/samopixokifetudanen.pdf
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/4312432.pdf
    • https://tutiwelureno.weebly.com/uploads/1/3/4/7/134714557/46931457945a.pdf
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/koluroxire_zobelis_vuluxedukaxixoz_tufojanepaxegoj.pdf
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/tivuvowisalulobog.pdf
    • https://babixugopanodip.weebly.com/uploads/1/3/5/3/135382952/jozeloj_tokimejomofis_vesunateniva_zuluxudojox.pdf
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/c256ec6c9df0.pdf
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/jalunikonide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bb682dca-7e36-45b5-a281-394a3e3d0652/que_es_diacono_en_la_iglesia_catolica.pdf
    • https://uploads.strikinglycdn.com/files/af26aedd-4630-4943-bc1d-ae304a964eca/does_disney_world_have_a_parade_every_night.pdf
    • https://uploads.strikinglycdn.com/files/4dad2960-cd5b-403e-849d-2d7901ff805d/alfabeto_coreano_hangul_completo.pdf
    • https://uploads.strikinglycdn.com/files/212a267b-20e0-4326-9905-104917bc356d/digital2_tablet_lost_password.pdf
    • https://uploads.strikinglycdn.com/files/df8cbc25-114d-4df6-a456-c2a160629622/nuwawepizasasedopot.pdf
    • https://uploads.strikinglycdn.com/files/0aa354dd-aeb9-4393-9919-fdb07776124e/juz_amma_bahasa_indonesia.pdf
    • https://uploads.strikinglycdn.com/files/fb58665b-b8a4-42c5-8be5-79327838d7c7/america_history_of_our_nation_workbook.pdf
    • https://uploads.strikinglycdn.com/files/12283b93-0295-4343-a0e6-d74c50d0719d/xabaw.pdf
    • https://uploads.strikinglycdn.com/files/3c81cdab-d809-4677-8117-1266b3f04201/gokijasuzozutikem.pdf
    • https://uploads.strikinglycdn.com/files/dd3f83b0-4c1c-4908-9d93-7eb0519d91e4/16781624239.pdf
    • https://uploads.strikinglycdn.com/files/f5478625-ec95-4997-8d8d-ad9920e7dd7c/types_of_conclusions_in_essays.pdf
    • https://uploads.strikinglycdn.com/files/c9d724f9-e834-4a97-88dc-604f6b0df678/47871581577.pdf
    • https://uploads.strikinglycdn.com/files/7db5f16f-fe4a-4f7e-8140-0a2cd156cd1b/insteon_thermostat_troubleshooting.pdf
    • https://uploads.strikinglycdn.com/files/caa3e9c1-9842-4337-a278-51819ee79f9e/sundance_spa_models_2000.pdf
    • https://uploads.strikinglycdn.com/files/368bd671-3473-4e2c-82b9-5b6b71e34efa/brother_hl-2270dw_toner_cartridge.pdf
    • https://uploads.strikinglycdn.com/files/547623b8-8245-4d99-8542-9942ba3071ee/killing_floor_2_ps4_co_op_split_screen.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_off0000e818.bin
81e40bbb539adf9c4e11d834ee8c4a22e0e86ea300af5ce9ac199234c1f71e27
pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 5112 bytes
font_01_sfnt_off0000f9b6.bin
fd86bca828dc278c563a3ac716bb30bee1a2120ab3c02609e1cf05e3ac96b003
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 11280 bytes