Malicious PDF — malware analysis report

Static analysis result for SHA-256 12535093ff59edec…

MALICIOUS

PDF

76.2 KB Created: 2021-02-09 23:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f69fd5caa84704e571028e04c49cb40e SHA-1: 271e67d25167bf7fc66cd93f2c7bfa837bf4b329 SHA-256: 12535093ff59edec97b505a83dde407720e66769a514a7183a52f06e5b607693
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=yasin+dan+tahlil+brunei+pdf PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/bjaidii/bavafumunidakulojaman.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/dedapumo.pdfIn PDF document text
    • http://rivifosa.iblogger.org/descriptive_survey_thesis.pdfIn PDF document text
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/6314168.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/fapaxixazaka-donunofog-dabolotivazow.pdfIn PDF document text
    • https://cdn.sqhk.co/julubesaf/qEiaid7/tazuzazigowujolikitomew.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/4844736.pdfIn PDF document text
    • http://jobipelulimobo.iblogger.org/transformers_restaurant_balakong.pdfIn PDF document text
    • http://kameregeperiwaz.22web.org/sexoderutinaz.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/321_media_player_classic_android.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/dekevukibib_polajixazupu.pdfIn PDF document text
    • https://xutobegepoxebax.weebly.com/uploads/1/3/5/3/135333125/c240ec2243.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/ieyUQiQ/passcode_lock_screen_wallpaper_iphone.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/bolami_puzot_wemilazuz_vatolinuzowaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://meluromotav.rf.gd/pogako.pdfIn PDF document text
    • http://kudugumokob.epizy.com/cis_and_trans_chair_conformation.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AF 5228 bytes
SHA-256: 7bf27133653311253aa9219bd8cea9cd47edd0c4291486c1c8720dc02c0e8f96
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 1888 bytes
SHA-256: ada6ede84a6d2c7dfdbabf8b3fc515008ff2ab13392d116f6f3a4ed42150c0b1
font_03_sfnt_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 10620 bytes
SHA-256: 68566419c5117e26ec964bbcf92d3335071bafd4de1d1fec69e9bcb15b853846
font_04_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 16992 bytes
SHA-256: 43be7094981c5c0bc58c2bb20ce3dd2a7705898873a820e070510457c3ea49e1