Malicious PDF — malware analysis report

Static analysis result for SHA-256 3754c68326fe5cfc…

MALICIOUS

PDF

86.5 KB Created: 2021-03-25 14:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6dfac3273a9d368294717566cf6bc157 SHA-1: 7891d242b9d219416c88f3f4725689010fdef30f SHA-256: 3754c68326fe5cfcfe92151666375537429582d4823073631916cb9fac4432c7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/strik?utm_term=yoga+poses+book+pdf+free+download PDF link annotation
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/387b82330bbe0.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/xevuvobalegamimaxom.pdfIn PDF document text
    • http://afracheat1.xyz/15002899237r444s.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/ijePibA/big_emoji_stickers_for_whatsapp.pdfIn PDF document text
    • http://babysampler.com/ancient_magus_bride_episode_2414qtw.pdfIn PDF document text
    • http://pexulabin.iblogger.org/furizinu.pdfIn PDF document text
    • http://help-violation.com/kofenigazivemufosozafasav0t0e4.pdfIn PDF document text
    • http://gotesesevuzi.iblogger.org/48498277469.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/wFkjazm/flight_pilot_simulator_3d_apk.pdfIn PDF document text
    • http://ecosbor.net/565891804220cn6f.pdfIn PDF document text
    • http://wbigs.space/ampex_601-_2_manualqy251.pdfIn PDF document text
    • http://jitutirujemi.22web.org/pre_retirement_planning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2141c71-b29a-4282-a8ee-443ba5a803e1/antiderivative_of_sin2xcosx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6324ace-9603-4f6e-a028-cf052fbb33cf/70836880711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8508e72c-b3e6-43d8-ad3b-53b8ace6f372/42236386492.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/70050744535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbf9226-ce9c-4132-82c9-f3a7ca396207/imax_b6_laptop_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d6d196-7714-43e6-9796-2bad2e5e5063/wekirudo.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/78494122312.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/tamilrockers_hd_movie_2018.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 5464 bytes
SHA-256: 4c0462cbae3d4f685c9885d330d482b6a9bcccd1382d4102118f6e09f3336113
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 3772 bytes
SHA-256: b9b49a3c453c53986d7a61d4291ac5a87065d82ff96be43ef0dca6427e6dc540
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 11972 bytes
SHA-256: 0ee6d0eccf16c51f8d6cedf997fcc27025c4f5599866971e7c9fd43b73608560
font_03_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 5672 bytes
SHA-256: 6a57411cd75fcab10d191fd4f3280047c00512c72c17f73a55cf48eaef77e610