Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5a4ab315fa2027…

MALICIOUS

PDF

79.9 KB Created: 2021-04-30 05:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5147a55d6c620810ad9c520b8335b7f SHA-1: 74bdd57f963c3dc74d06553f1ef0f44bbdd1a640 SHA-256: 5c5a4ab315fa202726e9842826f2f123d2a3021c3220b61135a36d0c9ac0cbdd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The presence of multiple PDF link farm heuristics further supports this assessment.

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://nipisod.ru/strik?utm_term=does+brandy+melville+have+free+returns PDF link annotation
    • http://future-techno.ru/what_is_the_purpose_of_the_monkey_business_illusionlo30y.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/zuguwu-mipopikikero-wuvusax.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/lefedogazalar.pdfIn PDF document text
    • http://gsmall.space/tajejamilaxaxolku5q.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/8ebbb123e3c73.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/moto_g6_play_case_otterboxoo7wh.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/12753745042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/906d1569-a78d-464e-9d91-e4eb06763873/schwinn_ad6_console_replacement.pdfIn PDF document text
    • http://nizalag.rf.gd/bozujuterudixudufifod.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_73049c31e67c4e1fa8eb81deee9cdb11.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_388c9f425ef945a8ba961542ce02a74d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71471e4-eac0-418f-b18b-622bd045baa4/will_there_be_a_nerve_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/18023033664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8c65b7-f085-4723-b7f3-9bac8817784d/88852725274.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/indira_awas_online_application_form.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_8cd806cc29804f3cafc2bccbbd4a2ff5.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_5ffb8637709444218279a81a6fd258fd.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 5332 bytes
SHA-256: a9666b7ec81cf7e846801723e1291bad015a4caa2ff126c058b75d6df58cc4e3
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10772 bytes
SHA-256: b7921b5f0d46ec0be1284f4107965af686ea46e7bf6c7acdad9d9b81d66c4122
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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