Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca44021a7ca4e85d…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 19:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 814eb218c88b2a600906e04c855fa0b1 SHA-1: adda75682790f28e5caae46a6d14cc744338d5b9 SHA-256: ca44021a7ca4e85df0644bb7e9176d599666883e14042af13137a8b8226f77fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign content, but also includes a suspicious URL that appears to be part of a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing or trojan threat. The presence of numerous external links suggests an attempt to direct users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://jottigo.ru/123?utm_term=how+to+change+rheem+water+heater+thermocouple PDF link annotation
    • http://help-verifiedbadgecenter.com/element_elefw195_tva1s77.pdfIn PDF document text
    • https://buxarurusej.weebly.com/uploads/1/3/1/8/131856129/3323802.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/98d9bf15a81ab.pdfIn PDF document text
    • https://larezonisu.weebly.com/uploads/1/3/0/7/130738889/tozilozanezozu.pdfIn PDF document text
    • http://mavpa.fun/xilukawokenagalabyntfy.pdfIn PDF document text
    • http://luwimifamofuper.iblogger.org/kedezar.pdfIn PDF document text
    • http://ionatr.space/gana_achu_video_song_wapwonvbi6v.pdfIn PDF document text
    • http://ketorebagibof.22web.org/tawokepabanox.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://s3.amazonaws.com/womirofop/android_app_for_windows_phone_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/40000718056.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/42736906967.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/14921678115.pdfIn PDF document text
    • http://zilaxeputeso.epizy.com/business_card_backgrounds_vector_free.pdfIn PDF document text
    • http://wetovokerug.epizy.com/84166879840.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/amazon_stock_market_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/nupaxoxawene.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/zewuzisimokud.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 5056 bytes
SHA-256: 6d8a3861a2afdc98cf250735297f0d67f6b438d5b955e29bb4bf2792107261c1
font_01_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 10512 bytes
SHA-256: 4fa385f01ccc4a589a577ee8a154187ffd00420d4ff6f63e30982f85dd7d7df2
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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