Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae0b8190ffac2bd…

MALICIOUS

PDF

107.1 KB Created: 2021-06-01 16:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4a4c965e6dd6ea8883de5f4f3d8d70f2 SHA-1: d96e92993cda1633050c2ff74aa52cbe0a4aef03 SHA-256: aae0b8190ffac2bdf9bbc8098da3cab18f31259e64b5220f42bdedc0e8f0dd8a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, including one pointing to 'dafemum.ru' with a query parameter suggesting a lure related to 'herpes labialis treatment guidelines cdc'. The presence of a link farm heuristic further supports the idea that this PDF is designed to redirect users to external, potentially malicious, websites. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=herpes+labialis+treatment+guidelines+cdc PDF link annotation
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/zexexumidabozu-fuzejesupumak-wabexed.pdfIn PDF document text
    • https://pozuzabo.weebly.com/uploads/1/3/4/4/134432083/peradup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_6048648139329.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/d707108a91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5fdd67bf26703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603b7b2fd8231.pdfIn PDF document text
    • https://muzokive.weebly.com/uploads/1/3/4/4/134498707/gusobubazurixoba.pdfIn PDF document text
    • https://bixaguvukimub.weebly.com/uploads/1/3/1/8/131872105/kezudoranumija_zosivuwebuta_limegemewezok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_6042ca8d64927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_60188217e663f.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/9658db6a-ce75-4add-8b3f-8da55d267b06/bonuzepobewipefinazizaxe.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144451434/10104884749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32597d21-f1c7-4008-bdb6-3e7ec307d437/how_to_teach_literature_review.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/wixeduputifodupiteli.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144456387/77900033010.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419568/how_to_connect_veryfitpro_to_watch.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413874/tidun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9d57ba-dac8-4f01-910c-1b8a0a2256e9/how_to_train_legs_for_strength.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e5e1a98-bcb9-4ece-9fac-1d0fc94e49de/is_the_servsafe_test_hard.pdfIn PDF document text
    • http://mukonisu.pbworks.com/w/file/fetch/144446796/mimepuwel.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144446826/mipevi.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_off000157ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EC 5268 bytes
SHA-256: 627d8f9db46896846c546f4dfc478e1aa0cb43baa4ef645ca478c32948f9b819
font_01_sfnt_off000169a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A7 11656 bytes
SHA-256: 3cfc11d79efc30a8c4d3ab198339bef6b1f89e729c2417d32d1d6c4fd66fdf89
font_02_sfnt_off000190e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230