Malicious PDF — malware analysis report

Static analysis result for SHA-256 deae825e3b97ace5…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 00:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad24c9344fb28af48f9b59d63e930dc SHA-1: 530de4662b1087525cc041f5091fa67ee66b6bec SHA-256: deae825e3b97ace53798654ae62af33d0cb6f00e49d7c2262489d1f575ddeadf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with a high concentration of algorithmically generated URLs, indicating a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further suggests a lure for users to download files. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=best+movie+downloader+apk+free+download
    • http://freshka.fun/make_it_stick_the_science_of_successful_learning_chapter_2_summaryehjcu.pdf
    • http://italdom.fun/726067939351n8ml.pdf
    • http://reduslimer.website/856666770037ckla.pdf
    • http://vodoroding.info/wilazamodimuvadokomagififojmwf.pdf
    • http://pesale.pro/ace_ventura_full_movie_720psc7y4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_0a252aa449dc45b6b275d00749e5da96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/adae48c5-54d7-4f7e-8f8c-ef6afb5043eb/46221743963.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_84ee05aea0dd489e9524e22dd8bdfe34.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_52fb26158f194af4910b234900eda309.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fe7214b7-64b5-417c-857d-2d2e10639c5e/sijerisakinoju.pdf
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_fa95b3f68a954d0c96bac4191d53e58c.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_71c0dc2c56e54609aa35f18e6227529e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bcb4e667-9d81-4b2b-9f93-1c67b786ecae/how_to_remove_call_forwarding_on_iphone.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_bbd98d59abcf41969324e6c0d5cd0911.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23e3665d-cc2f-491c-acd9-2fd18e60a179/63951465021.pdf
    • https://uploads.strikinglycdn.com/files/765d504f-d89e-4aaf-ba02-a33ec106dfa7/puduwifuvovosefukesago.pdf
    • https://s3.amazonaws.com/fukezavazuj/98090290483.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e482.bin
65f0d451d8901a8e9ccd78b436da766462a061d1d35a1821db08674e48018cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5240 bytes
font_01_sfnt_off0000f648.bin
465f1d1c47ee897f84344c4f096722780c82583aa84c0d31f0f4fed4df0b29f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10648 bytes
font_02_sfnt_off00011ad9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 4324 bytes

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