Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7de660af4e0a20…

MALICIOUS

PDF

61.5 KB Created: 2021-02-16 13:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d0cfb38d7933d835b5942ca5901e6cfb SHA-1: a916541b370efa27b353dd93c6dd934dae00af31 SHA-256: bc7de660af4e0a2050a653a16ffd0de6b34f303e61fd72838b1b7d2e27c50a3a
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. No scripts were extracted, but the document's structure and URL distribution strongly suggest it's designed to redirect users to malicious sites.

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jottigo.ru/123?utm_term=what+are+the+8+developmental+stages PDF link annotation
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/woramuwu_leniz.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/dojufetej_xuwefabo_gozibor.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/e005633ad6af2dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5fe1012025bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fe7bd921bded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ffd2b16bf6a2.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/7680547.pdfIn PDF document text
    • http://xipulax.iblogger.org/fevato.pdfIn PDF document text
    • http://tradebot.space/befojikujutocvrm8.pdfIn PDF document text
    • http://znasila.ru/diary_of_a_wimpy_kid_2020_new_bookc7uaw.pdfIn PDF document text
    • http://amsidgi.xyz/zoponipugamiwadeeuz0y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407793/normal_6002b8f8073ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilibosukotijob.epizy.com/css_button_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/guided_transmission_media.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/41838632970.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/fishing_guides_in_everglades_city.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/78270654628.pdfIn PDF document text
    • http://jegepifewomu.epizy.com/gukeni.pdfIn PDF document text
    • http://rarixigowof.epizy.com/carcosa_fuzz_manual.pdfIn PDF document text
    • http://rirazito.epizy.com/54265743584.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_off0000b687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB687 5640 bytes
SHA-256: 511300d7afcee34d7884b3bd6dbf777256278343c7412fef06699b0d749666de
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 9104 bytes
SHA-256: d01d8db216c1c4f6d49bccc7a82aa42f4694e023602d5664c5ba03b5b7c2c8d3

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