Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80cc52eb6489a30…

MALICIOUS

PDF

89.5 KB Created: 2021-03-23 13:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d99aaf54642b55d02fed94a18c2b02b SHA-1: e68dca78fdb0557d4e18a507b702ddc46272bb40 SHA-256: b80cc52eb6489a309714d3e019ada1feb1534c9bfe23df597c1502f9d2cc3732
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=physiology+of+glucose+metabolism+pdf
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/wukovewilejoledef.pdf
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/dfae5ab185b0f.pdf
    • http://donuliwobem.iblogger.org/62068122844.pdf
    • https://jasutabaxe.weebly.com/uploads/1/3/0/8/130873915/pokeb_jatumedusabalaj_nixamoz_modewixotubibi.pdf
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/5992121.pdf
    • https://nonoxatuvel.weebly.com/uploads/1/3/2/6/132681685/ac9ab66dc9f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_65a3599949ad48d3a29bc3a27a1d4b16.pdf?index=true
    • https://uploads.strikinglycdn.com/files/831c741e-4cf6-4f17-a343-f66d852ac745/how_to_sync_2_jbl_flip_4.pdf
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_6d36f9069975440d9a12e81635c2e639.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_566c5f0951c34e099ab8c7a0e21e81e2.pdf?index=true
    • http://xesepodine.rf.gd/business_intelligence_analyst_job_description.pdf
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_c8b70213645f400c8f1258c1065393a9.pdf?index=true
    • http://kujujeta.epizy.com/avengers_dd_guardians_of_the_galaxy.pdf
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_6a31f2f38a21415d8c239e0fbafa488c.pdf?index=true
    • http://bemisiba.epizy.com/localization_accuracy_test_data_sheet.pdf
    • https://uploads.strikinglycdn.com/files/a7830e56-d793-4710-8408-bb65728cc40c/87986380326.pdf
    • http://zoxogonewa.rf.gd/what_fast_food_places_give_you_free_stuff_on_your_birthday.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fc3.bin
2e41a9401c1d1a91ecbe77487a7304980211029cdaf511fc093371f7b828b135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 5716 bytes
font_01_sfnt_off00013314.bin
1081a45845fb9c7e1b2cbd8a04b2064391abc64cdaa22dbcb37d7bfffa4e6d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 11188 bytes

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