Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc7f50a4efe54f8…

MALICIOUS

PDF

101.4 KB Created: 2021-03-17 04:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81692c2c2782d2dbe178ac154664e2e1 SHA-1: 56acdbbb1d3401d9ecfccfd381a7d30b6e065545 SHA-256: 7fc7f50a4efe54f87be59887fd32ee44bb9cd1780ce59854f89f2ea42c8f61ee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to boost search engine rankings. The primary URL, https://pelibifir.ru/award?keyword=hindu+baby+boy+names+starting+with+n+pdf+download, suggests a lure related to baby names to drive traffic to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=hindu+baby+boy+names+starting+with+n+pdf+download
    • https://milarenu.weebly.com/uploads/1/3/2/8/132814898/7b4b4e64bae.pdf
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/darivoted.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_603701d2accae.pdf
    • https://static.s123-cdn-static.com/uploads/4486051/normal_600321b6d6a6d.pdf
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/fad73c.pdf
    • https://cdn-cms.f-static.net/uploads/4475997/normal_601ac459ba316.pdf
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5fde58538b279.pdf
    • http://carluxepaint.site/zizedapil8tgx.pdf
    • https://cdn-cms.f-static.net/uploads/4379032/normal_6018aa0f51507.pdf
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/7436183.pdf
    • http://bestrongbyg.com/the_spectacular_now_full_movie_free_download_mp43f08e.pdf
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/waxulasuwe.pdf
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zerodawoti.rf.gd/vshare_ios_5._1._1.pdf
    • https://s3.amazonaws.com/xukanomarexumu/21718918670.pdf
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_6a3797c54b5a4dbfa14508681bb85e02.pdf?index=true
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_3bf6796a00824c4e8e8537b2d0f49451.pdf?index=true
    • https://s3.amazonaws.com/fukepez/atlas_anatomie_humaine_2018.pdf
    • https://s3.amazonaws.com/divelikubapiwaj/luvulipamekagumadijanal.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_d757c2d467844787bfdc16f7e2788ca2.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_d0c14578202e45ce9e1d305d4bd05c21.pdf?index=true
    • http://wewonak.rf.gd/gutepopodadoxogojupufuner.pdf
    • https://s3.amazonaws.com/mexesazaxasa/8910230626.pdf
    • https://s3.amazonaws.com/mozirolinitaje/44936954097.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://gitlab.com/smc/meera/blob/master/COPYING
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001479d.bin
bf8417a06d67d996b840f0557f04638f6375050a823ef926c8e7c3cc96f41397		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1479D 3188 bytes
font_00_sfnt_off000134a2.bin
976db4fc70c1f17fed7d97d97b683afe40f88f01ecf7bdedee75dbd1ccd20ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 5632 bytes
font_02_sfnt_off00015406.bin
2a64a85a01e97c4738aebb34183d54c2a7042b6b42a122818a11e571a8a88f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15406 12296 bytes
font_03_sfnt_off00017a76.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A76 4324 bytes

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