Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ab77ba0528c5ed…

MALICIOUS

PDF

88.3 KB Created: 2021-01-10 07:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a645173dbdcd416cfde974337adf630b SHA-1: 1f0929993ae1d930d4fd35eb1debb5fc5728cff3 SHA-256: b1ab77ba0528c5ed9e0b12e676f935b2d01e41ecd4e26709b431540881c5831f
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and exhibits characteristics of a link farm. The presence of urgency-related language suggests a phishing or social engineering attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/123?utm_term=ap+lit+prose+essay+examples PDF link annotation
    • https://mixuzurul.weebly.com/uploads/1/3/2/3/132303374/1dfc06dc2dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5faf41468a085.pdfIn PDF document text
    • https://site-1173386.mozfiles.com/files/1173386/car_emi_calculator_california.pdfIn PDF document text
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/0436193.pdfIn PDF document text
    • https://site-1174506.mozfiles.com/files/1174506/warriors_game_schedule_2019.pdfIn PDF document text
    • https://site-1172756.mozfiles.com/files/1172756/lenazoxerekeboja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f88b1634afa1.pdfIn PDF document text
    • https://site-1193591.mozfiles.com/files/1193591/answer_key_tricky_hard_riddles_with_answers.pdfIn PDF document text
    • https://site-1168274.mozfiles.com/files/1168274/galaxy_glory_hack_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_5fd116e107ae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448743/normal_5feafa7be389e.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/47455.pdfIn PDF document text
    • https://site-1207652.mozfiles.com/files/1207652/nonejezifazuviwegogir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fb8ce7663c9e.pdfIn PDF document text
    • https://ladupizisegi.weebly.com/uploads/1/3/1/3/131380895/tepijaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kabisebax/51253638900.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/95416947261.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 5124 bytes
SHA-256: f4f5354d181bacfd33741af72d9e8e5fd07635ef0f5d11086df07aeb501dbd84
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 11224 bytes
SHA-256: 21400c13fc4e3b9688250fb68dfe6ca6ee0cba38015da31b42d3707926c89744
font_02_sfnt_off00013e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8D 16288 bytes
SHA-256: ef0fe5e4c3df87daa3c22f420b1c38346ade548d775f49ca8892d494fcc58392