Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a3578ded52bac6…

MALICIOUS

PDF

86.7 KB Created: 2021-03-05 18:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d771ba5f8f231abfdc74c5531d55b852 SHA-1: 91bbf0790499fa2cc05fe1110b8f45ccee484215 SHA-256: a4a3578ded52bac60bce0dfe2dec7f3ffe6c003aae215202cf4ccec2852d387a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to mimic search results. The primary URL suggests a lure for downloading "Malgudi Days" PDF, but the heuristic firings and the sheer volume of suspicious links indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seumenha.ru/wix?keyword=malgudi+days+pdf+free+download PDF link annotation
    • http://gagimubu.mywebcommunity.org/how_to_connect_a_harbor_breeze_remote.pdfIn PDF document text
    • https://jikigalogadod.weebly.com/uploads/1/3/4/6/134647375/robulukarasow.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/e40e161.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/regimobu_jogilebum.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/1446386554.pdfIn PDF document text
    • http://deflecfcvy.best/moto_g6_play_verizon_bootloader_unlockcmvhj.pdfIn PDF document text
    • http://2022god.com/bsa_service_manualomx77.pdfIn PDF document text
    • https://javewadeje.weebly.com/uploads/1/3/4/8/134882586/1461548.pdfIn PDF document text
    • http://abanca-electronica.com/aruba_215_access_point_manualouf14.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/what_is_the_meaning_of_stanza_in_a_poem.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/7926929.pdfIn PDF document text
    • http://specrazreshenie.com/gazewamakol44lil.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/gimuzakewemuges.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/tujuluwura_zupupezowifilaj_mojexitag.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/veguva_jigunokezup_nudoke_vozekiti.pdfIn PDF document text
    • http://magicwoolshop.com/small_baby_smile_imagesc0pq4.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/creating_shared_value_examples_2019.pdfIn PDF document text
    • https://losaburi.weebly.com/uploads/1/3/5/3/135322327/tozasexutel-rujuxixogiveru-dinizejiredolen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fovezewi/37588091972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5bd281-74b4-4083-9fa6-0073ccde6a06/oxford_picture_dictionary_english_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/13636522701.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/weweruxowivedemekazudakal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e13ef11-a5e7-47b1-a363-62351d74469c/air_force_one_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a2b293-101b-4523-a817-4049ab98dd09/48828426135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f323bc3-7ed6-4d67-aea3-92f9f3675c79/morafogem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc0cb203-bc83-4ce7-8ef9-75d5160cac44/what_is_the_best_wireless_laser_printer_for_home_use.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/8625215766.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/japize.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/supebubewakusiwirujosuli.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_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 5408 bytes
SHA-256: 82d6b44a95d380eb4356acae6c6f2efb937d1ca849905a1b2252bfaae4ee0d41
font_01_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 10316 bytes
SHA-256: 60ea522cc819fe159598aa3b7df08ac4053f3d30d5213c89c5f7315583a3186c