Malicious PDF — malware analysis report

Static analysis result for SHA-256 901f84706986c549…

MALICIOUS

PDF

84.0 KB Created: 2021-03-21 00:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 27611fb078a0a556b0973df8c1a347a0 SHA-1: 674dc8d3dd7af5ea9ce66ffe0e3512192554baa5 SHA-256: 901f84706986c549e6c2ed0683e6b53dbb2d5fa570e15856ad83d9250647d9fb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to searching for a movie, which is likely a lure to direct users to malicious or spam content hosted on the extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=watch+the+joker+full+movie+reddit PDF link annotation
    • https://gikunagab.weebly.com/uploads/1/3/0/7/130738902/7dbf6a93c549ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/ggfhagi/sport_maxx_rt_tires.pdfIn PDF document text
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/8824348.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/2gh0b7X/incident_report_form_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/ahjhjsj/calculate_percentage_between_two_numbers_formula.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/wiaghjg/kosumakitakukepax.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/ifQ99ib/tractor_pull_videos_2020.pdfIn PDF document text
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/mirasikixurikozugemo.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/6760f0fd-2a1c-414a-9f50-7daf74b7074f/28829858721.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/gemavaxutin.pdfIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_ebb42f2e58f148ca9c26ef550e4a96f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cc4aac-110c-4e63-ad82-5cc80c1358ce/20025182129.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/42600036471.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/22922845687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab282cd-6d1f-4365-88c0-1502284cd18a/11640008293.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/kebizixapokumewuvujo.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_e87cb790c98d433bbacdf4d7215b8d32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c5bd24-7d9d-494a-9f9b-700e417ffa37/how_to_fix_an_unresponsive_keyboard_key.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/is_how_the_grinch_stole_christmas_on_netflix.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_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 5296 bytes
SHA-256: d4ccd2d9b88035c774df9a9b726903654548d0aca2408e746997019818f772c7
font_01_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 11164 bytes
SHA-256: a1f38a0f12731553ce01bb4058fadd660ae487886ad1f176fdf542ee4832dfc7