Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5722074e90151e9…

MALICIOUS

PDF

71.0 KB Created: 2021-03-27 21:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eaa6576b016373b1d247bd9aa65b49a9 SHA-1: 13068b49cebab70ff5487d5513037630e8884c09 SHA-256: a5722074e90151e915ce94c8098d52a4e2373fec38778ca63960df55447aab3a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is dafemum.ru, which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=2016+ram+ecodiesel+owners+manual In PDF document text
    • http://fasad-dom.site/sailing_knots_bowlineh8sya.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/vajaxuxorex_rujatupuw_defagiwewupo.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/puzezuzugidu.pdfIn PDF document text
    • http://kumaboperituf.22web.org/public_speaking_tips_for_students.pdfIn PDF document text
    • http://bonus332.site/noribelebekezogakegidijem7tjtt.pdfIn PDF document text
    • http://sluzhba1.net/stopping_by_woods_on_a_snowy_evening_tone_and_moodtt6oi.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/gixelodet-wated-pigokominifo.pdfIn PDF document text
    • https://zobirifojufegot.weebly.com/uploads/1/3/4/3/134374070/7915363.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/6543862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_44d135bdcef94c7ca8c80f249aa43b15.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_8ebaf1473bda4a2c85a79548309d952f.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_f037547083724408b7d0875d8d2774a7.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_44104565b3df42c094f2ef0a563513b0.pdf?index=trueIn PDF document text
    • http://wadatexutogowig.rf.gd/34083909984.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/where_is_the_drain_plug_on_a_lawn_mower.pdfIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_a555e2e71bf3411996ce6d457e0f9d45.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_3e9d1c2eb2bd48c4a5284be1f535f756.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_d757c1c2acdd4360b177cc631bf0e610.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_1510a9778ac94f4bae2a070e939b9287.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/what_happens_if_you_sleep_while_wearing_contacts.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_32ae94bb509547f1a5af0a0e677f66b5.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 5560 bytes
SHA-256: 6f69e8d7e0b436666802925c06fd5f35f1e9ed67db86ea3b84541236355efa04
font_01_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 11372 bytes
SHA-256: ce3b286821f6b0aa72bceae81358f4c137dfe33a6c289a4eca64f803631b6649

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