Malicious PDF — malware analysis report

Static analysis result for SHA-256 655a0992ecab5905…

MALICIOUS

PDF

66.7 KB Created: 2021-03-22 19:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cbc5603a5d92ad3af0639fd2466605ae SHA-1: 29f5dcaaa3c6e5b985ab02c83f8d3922309f88f9 SHA-256: 655a0992ecab5905769219772dc732867d46edc7802be050d7a09103237892d2
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'Pitt rental center', likely a pretext to encourage clicking the malicious URL. No scripts were extracted, but the presence of numerous links to disposable hosting and redirectors strongly suggests a phishing or malware distribution attempt.

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
  • 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 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://crophysi.ru/wix?keyword=pitt+rental+center In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60286bb5d3bac.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/quran_arabic_madina.pdfIn PDF document text
    • http://new-volosi.ru/present_simple_vs_present_continuous_exercise_online4ortq.pdfIn PDF document text
    • http://kukushpa.fun/tazonanijewogepubafuf0mzv.pdfIn PDF document text
    • http://natorg.fun/wbsedcl_duplicate_bill1609z.pdfIn PDF document text
    • http://findfreegirl.com/sedulakuwelidapimikilkmsom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5fda4b27708f0.pdfIn PDF document text
    • http://bigowet.xyz/damn_right_it_was_a_good_day_gifuo8rr.pdfIn PDF document text
    • http://milanomoda-italy.site/85723794171gh55n.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/jerhdCm/v_shaped_model_in_software_engineering_ppt.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/99918863705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_600c9f6823609.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/fxwgeAd/53925912719.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://risexogukif.rf.gd/35907626500.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/how_to_check_car_condition_before_buying.pdfIn PDF document text
    • http://litegizixusiw.rf.gd/networks_manifest_destiny_worksheet_answers.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/rational_emotive_behavior_therapy_book.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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 4616 bytes
SHA-256: f3f47aca0ed7262e527fbdfc089e1329d86f6c2ad82974105a31be5b7de4a1d2
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 10920 bytes
SHA-256: 411899abd3cc6cb52fad53aadd7cfe8baa40532651e863e26d70f05da9cce519

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