Malicious PDF — malware analysis report

Static analysis result for SHA-256 848760607871a3e8…

MALICIOUS

PDF

82.3 KB Created: 2021-03-08 20:12:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02f7645c84e2e06a3e2fb0c9365ed5a0 SHA-1: 8a3c665abeaea05e5479a53e0ad2a8dca128f7c5 SHA-256: 848760607871a3e8ecb0ace8fc6048d2b73f1859a1daedc0f15d5eeb5054df82
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs, particularly the one pointing to 'dafemum.ru', are indicative of a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=administracion+de+los+canales+de+distribucion+pdf In PDF document text
    • http://mowogaw.mypressonline.com/19080375392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_603c39ec79a5e.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/the_merchant_of_venice_act_3_short_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484623/normal_603980d96b3dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexesunewe.rf.gd/polk_magnifi_one_reset.pdfIn PDF document text
    • http://nodimetonakijeb.epizy.com/simple_past_tense_negative_and_interrogative_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ffc6db5-407f-4f86-bda3-2fa57cb60625/daxijatugopel.pdfIn PDF document text
    • http://totuxivez.onlinewebshop.net/bayesian_data_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50ea2a8-4d02-4c12-9deb-4433bf11a43b/java_8_tutorial_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/41918884264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c876925b-9a53-446c-8a7b-03f90f56f429/2596160789.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/ravpower_filehub_travel_router_n300_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdebe030-28b4-46ec-b7b4-bde7590629e1/60007241994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7555ff35-6e58-4418-abe0-fca2bdc1fc2f/nokuveduse.pdfIn PDF document text
    • http://wiwisogovas.rf.gd/tagikukevepa.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_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 5432 bytes
SHA-256: 8d247447a31f26ab537d8fef580443aa10588c5d376d82801c6c3dc09a815161
font_01_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 11904 bytes
SHA-256: 095a40a54a68308f9ca75e235029735adf20d0d6af298343ec49d9b46996ef9e

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