Malicious PDF — malware analysis report

Static analysis result for SHA-256 70db69c0c47c05d4…

MALICIOUS

PDF

86.3 KB Created: 2021-01-24 11:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aef3927431da33b06576344dc0e61742 SHA-1: 7ab13ab5695c7462503822a42cc2e8d556b7067e SHA-256: 70db69c0c47c05d4e0a2bf7a6bf516fa3860fd88a9d1f8b28d95a98639f8d8e9
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various PDF documents hosted on disposable or potentially malicious domains. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The primary function appears to be directing users to external resources, possibly for SEO spam or to serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffnew.ru/aws?utm_term=digital+adoption+platform+comparison PDF link annotation
    • https://cdn.sqhk.co/mivesumor/CU8qifS/electrical_circuit_design_software_free_download.pdfIn PDF document text
    • http://vnds-super.space/xorobc8n5g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fe797ab0199c.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/hSqqgjg/rare_freshwater_aquarium_fish_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_60072e889bfb7.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/nenijewafoxega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469860/normal_5fe14879c4ca3.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/6wcjihj/rinurururavuwozujozo.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/19d7728085.pdfIn PDF document text
    • http://christinaanddavid2019.com/truck_racing_game_free_downloadtiydo.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/cggEifO/16746953616.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/cihtjjS/groupme_icon_meanings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ffa561697de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fd7af9306f23.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://s3.amazonaws.com/latufenaw/wukizobax.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/dbz_android_13_fanfiction.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/pepezujawemogidurerasul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 5144 bytes
SHA-256: 923484b69ebb22405149b4a7633c1a330c82655b653d854a670e282b18c5a407
font_01_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 10228 bytes
SHA-256: 6009514b9b476982f016a357d4be2b3e8db1fd5e2e19b2d15d5c8ee9ec5c8654
font_02_sfnt_off00013e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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