Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a65d87cbddf5243…

MALICIOUS

PDF

70.8 KB Created: 2021-03-10 01:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f9af530817a3c8301e494fa89b3242b2 SHA-1: 93bd7df2ec370778f83c6c5c1e6e4525ad3db8ce SHA-256: 9a65d87cbddf5243fbad7b9d3942140fddb43eadaf7aacc1c51d921047311d56
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed as a link farm on disposable hosting, aiming to direct users to potentially malicious content. While no scripts were extracted, the presence of numerous URLs and the ClamAV detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=alveolitis+humeda+dental+tratamiento+pdf In PDF document text
    • http://tugokutuli.scienceontheweb.net/pdf_cdf_discrete_random_variable.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/XlghjhI/19026850184.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/giYbje4/suwudimudupagigav.pdfIn PDF document text
    • http://getcreditreport.info/new_craftsman_chainsaw_leaking_bar_oilpau7u.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/75599486062.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/3875754014.pdfIn PDF document text
    • http://fuxutigox.mypressonline.com/vijukexebopegire.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/45758711729.pdfIn PDF document text
    • http://getchambre.xyz/derek_fisher_matt_barnes_bleacher_reportmnteu.pdfIn PDF document text
    • http://hookup154.online/211591390004gtzx.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/tudivopamamigafomezubinadebpth.pdfIn PDF document text
    • http://techanomic.com/logesexumazodovap3eidr.pdfIn PDF document text
    • http://jepunigotamub.iblogger.org/liropizowipurot.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/4ce22b2d-b023-4b5a-8168-3bc1754d9ef4/nixijujosesaviwozisajugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8def4bb9-dca3-4749-8bdd-5d503f67feaf/what_do_the_symbols_on_omron_blood_pressure_mean.pdfIn PDF document text
    • http://wafezejub.epizy.com/gusutixavoruzik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a144ab7-ca00-4e10-9e57-38f33f0e17d8/tezub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c7dd3d-b47d-4fce-926b-f1c934d29aef/rolefapitelavuzasu.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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 5332 bytes
SHA-256: 171ba75b0d6975f0ef2877439b1ca7e382c44e818b0d296947541a283e6de1a1
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 10392 bytes
SHA-256: abb12e0876140a7b98339fb1b27177a000e6b26a7f20f058fd920f46945e09e6

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