Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae349b4f971c1710…

MALICIOUS

PDF

118.7 KB Created: 2021-03-20 19:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d990c9ea05931d31ef72412756495778 SHA-1: 91cce2450d1681f13a260b21a3bb31b193dd5f45 SHA-256: ae349b4f971c17108b1d2d318c926ed4348c9b2fb3689c4aa2e67cfdeafb8a87
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • 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://lozipotod.ru/123?utm_term=cambridge+english+empower+b2+progress+test+answers PDF link annotation
    • http://vas-rem.ru/dirobuvozogemizedowofofptoy.pdfIn PDF document text
    • http://bejawutipage.mywebcommunity.org/gexigedirufigujebatamo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fffcb085fffe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5fcc3ad1ae143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_6053746e69842.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/kidezofijotubuvazb80f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5ff0a673b4ea7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_603aca3f72028.pdfIn PDF document text
    • http://dhl-order.info/what_does_navient_lawsuit_mean_for_borrowers1gm3x.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/88219759302.pdfIn PDF document text
    • http://micrometerdigital.xyz/425557829245bo1o.pdfIn PDF document text
    • http://powerpoint4you.ru/521996267268mwn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_6031475fd10f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_6052097f5183a.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/15031642506.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fff4aee5965e.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/7276be4f-f39f-494c-be8d-0ab98dcd2750/what_is_the_best_aperture_for_night_photography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5b06be-c274-4184-ab59-db8976ab2385/how_to_make_smoking_bisquettes.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/jewotobokumesurezupis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ed06b8-f3d1-416f-b892-657d9427c470/dabovuxabewumifegemuruki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece468ed-0ee1-4846-95f5-d478fd44c1a3/simmons_sd1000_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a996d1d-eba6-490c-968c-71b0235cca26/42733465068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e107b300-38b0-466f-bd04-611866b2c38f/comparing_fractions_worksheet_4th_grade_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186188d9-f250-41e8-8c2e-6c9532be9bee/how_to_use_ps_vita_memory_card_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298abe38-cffb-4e72-a2c5-e7aa3c6cb0df/samsung_vrt_steam_washer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1766a24d-8582-452a-843a-72166e01d900/brother_hl-5470dw_service_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13715 22184 bytes
SHA-256: 19e889c135d68542447490fbfc801899219c4cf4348a18e287dc60dc5c94b5d2
font_01_sfnt_off00017d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D20 5548 bytes
SHA-256: dc9df221334e3567e0ba8563e97dae6ec971ea6bd7f345085a9e8e3dca1eb5b8
font_02_sfnt_off00018fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FDF 15020 bytes
SHA-256: e447fc81098fa553a168196beeaf134306c5dbf7036789f613aba8193f494a84
font_03_sfnt_off0001be0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE0B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176