Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b868c8effd2719…

MALICIOUS

PDF

86.4 KB Created: 2021-03-27 10:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 32bc98df0483c744f6380d4489cbe05f SHA-1: aab72f046e55256784d35db242f105af32496d20 SHA-256: a2b868c8effd27195f65aaa222bb744fe5503e760a17bd74a266ece4eace9313
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically targeting a search query for 'acer aspire one kav60 user manual pdf' on a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=acer+aspire+one+kav60+user+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5fdebf2667b9a.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/how_much_do_medical_examiners_make_a_year.pdfIn PDF document text
    • http://fugilugidijud.22web.org/zamaguxipaxuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5fc67986e7eb3.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/zubirakotonuzizajijodur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_605d9d2a4beec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fdc1698515df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepewitibafef.myartsonline.com/gevuzepobitepufutaxamu.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_3b44c2c3d1e3453683606caf9c2904c0.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_13ef47505d7049a19cf2cfa33b9e8af2.pdf?index=trueIn PDF document text
    • http://kukelemut.epizy.com/food_and_beverage_industry_trends_2020.pdfIn PDF document text
    • http://warufadul.rf.gd/72974028566.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_360cd063eb5c4a0890a1d77e8d4d281e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/43470584916.pdfIn PDF document text
    • http://bimizuzaf.rf.gd/talunumebovovotukuzex.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_94307633910c45eaa2e249e9fec1b21e.pdf?index=trueIn PDF document text
    • http://bezukovopobav.epizy.com/nugabalobiguzegu.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/tunnelbear_vpn_android_apk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 5708 bytes
SHA-256: 008036e2a1bea478d98b7afc18908e447d0d0d9d13d96853d78ace7187dda512
font_01_sfnt_off000124df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DF 11044 bytes
SHA-256: f7a2324704d508c9cb9cd1e824e65bb4bfb604792a1d1b1b8ae3f0a2dad7ac1f

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