Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5d8e22b6409b63…

MALICIOUS

PDF

73.3 KB Created: 2021-05-31 21:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a9e42712a122fc9cb09ec8a5bbefb85 SHA-1: a67bba05231026450714ebcd13d5c49b8b17d51d SHA-256: 3a5d8e22b6409b63cb8a30de3d17da604577a93823d4a83ea17b1285c618bb16
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary one pointing to 'allytemp.ru', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/pbw?utm_term=how+to+select+electrical+cable+size PDF link annotation
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/f5e44df8570c.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/3137981.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/winedavusilum.pdfIn PDF document text
    • https://bokavijuporuxeb.weebly.com/uploads/1/3/3/9/133997451/dokovubadak.pdfIn PDF document text
    • https://babixugopanodip.weebly.com/uploads/1/3/5/3/135382952/8693375.pdfIn PDF document text
    • https://pivokobofu.weebly.com/uploads/1/3/4/6/134648089/gogumup.pdfIn PDF document text
    • https://pokenavij.weebly.com/uploads/1/3/4/8/134892290/5152139.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/efefc36d-6e36-4503-8c91-a902425ab400/fivarex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a39c56c-f030-4f9c-a39a-6f07c742cbd8/bissell_proheat_pet_turbo_carpet_cleaner_-_1799v_parts.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413748/what_is_importance_of_family_planning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042dfa97-5e3a-468e-ab29-8d7dad8230c6/27178748048.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/xojosibaluxirabatutesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5d8cfd-de6e-4823-9b2d-d7e81e27b5b0/how_do_i_find_my_starbucks_partner_number.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144423651/muferixabenekux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eda880d6-32db-4c41-b55e-686630be9a1f/ralphs_leadership_in_lord_of_the_flies_quotes.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/vowukigik.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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 5036 bytes
SHA-256: 467631b539c34f5d082c67b1bf65caea5248be973655ad76dafe53f10f63e23e
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 10452 bytes
SHA-256: 91cf84684644ba7eabf04261e18089e8669053c83e3d4f9f3c2fec9d93be03a0

Open this report in the interactive analyzer, or submit your own file for analysis.