Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d79be2bbd8cc08…

MALICIOUS

PDF

71.5 KB Created: 2021-03-23 04:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 55eda85bf97369e89fd948de0c6e1dd6 SHA-1: bd3e0eb8b778242d455eeb93f128a50e1f5700f8 SHA-256: 63d79be2bbd8cc089aca9b08264fe9db0a8a5f824336dbc822c3154d73f365f9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://crophysi.ru/strik?utm_term=stc+1000+manual', is particularly suspicious and likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=stc+1000+manual PDF link annotation
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/b46e123f55717.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/jowagezudiz-wexofopebipe-bezivemaje.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/rXsvjiv/pixel_car_racer_fastest_car_2018.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/ninaxuzorexonuf_dudalas.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/hcjhgeF/fnaf_vr_help_wanted_song_monsters.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/4337434.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/9c1fbfd.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/53942a66-6078-45ce-b73b-9de1d979dc1d/wayne_dalton_garage_door_opener_programming.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_4efdcd4cb16a4d61878ec31a85a97849.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_9fcb66c502fd46d9962b6ac969a3e668.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_fa3aca236cd7449d8938d1c2e22de7cb.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_ba63c3b3df964451a14dd8971cdef802.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/john_deere_x320_hood_removal.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_a3c16036397f4605900fa343cb8c62ba.pdf?index=trueIn PDF document text
    • http://wilafeduzavedew.epizy.com/guide_wire_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/cat_in_the_hat_knows_a_lot_about_that_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b79d33-f127-4ba0-b21b-5485d9bcaa7b/baby_bjorn_bouncer_bliss_anthracite_cotton.pdfIn PDF document text
    • http://mesuwirafifi.rf.gd/nugelawamazeliperokanoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/13153197312.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D7 4968 bytes
SHA-256: 9634f86361b19609d7b440f53762f341dbc8c0e5bd29ed94058a4bafaffd82d9
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 10020 bytes
SHA-256: d55170169ecf89a895710509b42462d79afcf420ed106a2d3d3fbba96e247bbb
font_02_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 16548 bytes
SHA-256: 3518c23a73c60d38d5ad85cf0303b7adbd1cb527b033af53c896c489d94918ce